Compendium of Veterinary Standard Precautions for Zoonotic Disease Prevention in Veterinary Personnel

Brigid L. Elchos State Public Health Veterinarian, Mississippi Board of Animal Health, Jackson, MS 39207.

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Joni M. Scheftel State Public Health Veterinarian, Minnesota Department of Health, Saint Paul, MN 55155.

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Bryan Cherry Deputy State Public Health Veterinarian, New York State Department of Health, Albany, NY 12237.

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Emilio E. DeBess State Public Health Veterinarian, Oregon Department of Human Services, Portland, OR 97232.

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Sharon G. Hopkins Public Health Veterinarian, Public Health—Seattle & King County, Seattle, WA 98104.

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Jay F. Levine Department of Epidemiology and Public Health, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606.

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Carl J. Williams State Public Health Veterinarian, North Carolina Department of Health and Human Services, Raleigh, NC 27699.

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Preface

Veterinary practices are unique environments that bring humans into close contact with many species of animals. Whether in a clinic or in field settings, veterinary personnel are routinely exposed to infectious pathogens, many of which are zoonotic (transmitted from animals to humans). Some reported zoonoses in veterinary personnel include multidrug-resistant salmonellosis, cryptosporidiosis, cat-associated plague, sporotrichosis, methicillin-resistant Staphylococcus aureus infection, psittacosis, and dermatophytosis. Infection control measures vary from practice to practice and are often insufficient to prevent zoonotic disease transmission.

The Veterinary Standard Precautions outlined in this Compendium are designed to minimize transmission of zoonotic pathogens from animals to veterinary personnel in private practice. The Compendium is based on current scientific evidence and the VICC members' collective experience and knowledge of the veterinary profession.

I. INTRODUCTION

A. BACKGROUND AND OBJECTIVES:

Zoonotic diseases are occupational hazards faced by veterinary personnel on a daily basis.1 Although the scope of zoonotic disease risk has been documented, guidance for infection control in general veterinary practice has been limited. Currently, infection control measures vary tremendously among veterinary facilities and are often insufficient to prevent zoonotic disease transmission.2,3 In human medicine, infection control evolved substantially with the recognition of transmission of HIV and hepatitis B and C viruses to health-care workers; currently, the cornerstone of infection control in human health-care settings is the consistent use of Standard Precautions.4 Similarly, the 2003 US outbreak of monkeypox virus infection among humans in 6 states, in which 18 of 71 (25%) affected individuals were veterinary personnel, highlighted the need for infection control precautions in veterinary medicine.5,6

Veterinary Standard Precautions are infection control guidelines intended to minimize the risk of occupational zoonotic infections from recognized and as yet unrecognized sources. Regardless of the diagnosis made for a particular animal, these precautions should be used whenever personnel may be exposed to potentially infectious materials, including feces, blood, body fluids, exudates, and nonintact skin.

New infectious diseases are continually emerging.7 Approximately 868 of 1,415 (61%) known human pathogens are zoonotic, and approximately 132 of 175 (75%) emerging diseases that affect humans are zoonotic.8 Global commerce, trade, and travel continue to increase the potential for exposure to zoonotic pathogens.

Although reports of exotic infections in veterinary personnel dramatically illustrates the need for routine infection control precautions, use of VSP would minimize exposure to many zoonotic pathogens encountered more frequently. Reported occupationally acquired zoonotic infections include the following:

  • • Multidrug-resistant salmonellosis outbreaks with zoonotic transmission to veterinary staff and students.9–11

  • • Cryptosporidiosis among veterinary students.12–16

  • • Cat-associated plague (Yersinia pestis infection) in veterinary personnel.17

  • • Cat-associated sporotrichosis in veterinary personnel.18–22

  • • Transmission of methicillin-resistant S aureus infections among veterinary personnel and equine, bovine, porcine, canine, and feline patients.11,23–33

  • • Psittacosis.34–37

  • • Dermatophytosis (ringworm).38

Veterinary Standard Precautions include strategies to reduce the potential for bites and other trauma that may result in exposure to zoonotic pathogens. During their careers, approximately two thirds of veterinary medical personnel are hospitalized or unable to work for considerable periods of time as a result of animal-related injury.1,39–42 Dog and cat bites, kicks, scratches from cats, and crush injuries account for most occupational injuries among veterinary personnel.1,39–42 According to 1 report,43 approximately 3% to 18% of dog bites and 28% to 80% of cat bites become infected. Most infected dog- and cat-bite wounds contain mixed aerobic and anaerobic bacteria. The most commonly isolated aerobes are Pasteurella multocida (cats), Pasteurella canis (dogs), streptococci, staphylococci, Moraxella spp, and Neisseria weaveri; the most commonly isolated anaerobes are various species of Fusobacterium, Bacteroides, Porphyromonas, and Prevotella.43 In addition, rare but serious systemic infections with invasive pathogens such as Capnocytophaga canimorsus, Bergeyella zoohelcum, Bartonella henselae, and CDC Group NO-1 may develop following bites or scratches.43–47

Needlestick injuries are also among the most frequent accidents in the veterinary workplace.48,49 The most common needlestick injury is inadvertent injection of a vaccine.1,50,51 In a 1995 survey of 701 veterinarians, accidental self-injection of rabies virus vaccine was reported by 27% of respondents; among large-animal practice respondents, 23% had accidentally self-injected vaccines containing live Brucella organisms.1 Additionally, needle punctures sustained during procedures such as fine-needle aspiration are potential sources of zoonotic pathogens.52

Based on the need for infection control guidelines that were specific to veterinary medicine, the VICC set the following objectives for the creation of the Compendium: to raise awareness of the scope of zoonotic disease risk in veterinary medicine; address issues specific to the veterinary profession; establish practical, science-based veterinary infection control guidance; and provide a model infection control plan for use in individual veterinary facilities.

B. CONSIDERATIONS:

Although elimination of all risks associated with zoonotic pathogens is not possible, the purpose of this Compendium is to provide reasonable guidance for minimizing disease and injury among veterinary personnel in clinical settings. The guidelines are intended to be adapted to individual needs and circumstances, but veterinary practices must first comply with federal, state, and local authority regulations, and modifications should adhere to the basic principles of infection control that are necessary to prevent spread of occupational zoonotic pathogens by all routes of transmission. The authors of this Compendium advocate a multifaceted approach to infection control, incorporating personal protective activities with appropriate administrative and environmental engineering control measures.

Employers should promote safe work habits. The cost of implementing these guidelines should be compared with the potential consequences of inadequate infection control, including sick leave or hospitalization of personnel, loss of credibility, and litigation.53–55 Training is an essential part of VSP implementation that is most effective if each employee understands the relevance of these guidelines to his or her health and the health of others.

Client education that addresses issues such as the importance of rabies vaccination of animals, comprehensive internal and external parasite control, and bite prevention will also help protect veterinary staff from zoonotic diseases. Veterinarians are accessible and expert sources of information regarding zoonotic diseases and should be prepared to inform clients of risks specific to their community. Written educational information should be made available in hospital and clinic waiting areas and on practice Web sites.

II. ZOONOTIC DISEASE TRANSMISSION

Transmission of pathogens requires 3 elements: a source of the organism, a susceptible host, and a means of transmission between them.4 Infection control involves eliminating or isolating the source, reducing host susceptibility, or interrupting transmission of the agent.

A. SOURCE:

Animal sources of infection include animals that harbor endogenous microflora that are pathogenic to humans, apparently healthy animals that are carriers of an infectious agent, and animals that are clinically ill. Environmental sources of infection include contaminated walls, floors, counters, cages, bedding, equipment, supplies, feed, soil, and water.

B. HOST SUSCEPTIBILITY:

Human susceptibility to infection varies greatly. Factors influencing susceptibility include vaccination status, age, underlying diseases, immunosuppression, pregnancy, and deficiencies in the body's primary defense mechanisms (eg, damage to intact skin, loss of cough reflex, or reduced production of stomach acid). Humans may be immune to or able to resist colonization by an infectious agent, become asymptomatic carriers, or develop illness.

C. ROUTES OF TRANSMISSION:

Pathogens are transmitted via 3 main routes: contact, aerosol, and vector-borne transmission. Some agents may be transmitted by more than 1 route.4

1. CONTACT TRANSMISSION

Contact transmission occurs when pathogens from animals or their environments enter the human host through 3 mechanisms: ingestion, cutaneous or percutaneous exposure, or mucous membrane exposure. Direct transmission may occur during examination, bathing, and general handling of animals or during administration of treatments. Indirect transmission involves contact with a contaminated intermediate object, such as during cleaning of cages and equipment or during handling of soiled laundry.4

2. AEROSOL TRANSMISSION

Aerosol transmission occurs when pathogens travel through the air to enter the host. Aerosols may be large droplets that are deposited on the mucous membranes or smaller particles that are inhaled. For most pathogens transmitted by this route, specific data defining risk of infection are limited; in general, risk of aerosol transmission increases with proximity to the source and duration of exposure.

Large droplets are created by coughing, sneezing, and vocalization and by procedures such as lancing abscesses and dentistry. Particles that can be inhaled may be generated through procedures such as suction, bronchoscopy, sweeping, vacuuming, and high-pressure spraying. Certain aerosolized pathogens may remain infective over long distances, depending on particle size, the nature of the pathogen, and environmental factors.4,56 Two zoonotic pathogens known to be transmitted over long distances are Coxiella burnetii57–59 and Mycobacterium bovis.60

3. VECTOR-BORNE TRANSMISSION

Vector-borne transmission occurs when vectors such as mosquitoes, fleas, and ticks transmit pathogens. Animals may bring flea and tick vectors into contact with veterinary personnel. Working in outdoor settings may increase risk of exposure to arthropods and other biological vectors.

III. VETERINARY STANDARD PRECAUTIONS

A. PERSONAL PROTECTIVE ACTIONS AND EQUIPMENT:

1. HAND HYGIENE

Consistent, thorough hand hygiene is the single most important measure veterinary personnel can take to reduce the risk of disease transmission.4,61,62 In veterinary practice, hand washing is preferred over the use of hand rubs because hands are routinely contaminated with organic material.

Hand washing with plain (nonantimicrobial) soap and running water mechanically removes organic material and reduces the number of transient organisms on the skin, whereas antimicrobial soap kills or inhibits growth of transient and resident flora.63,64 Plain or antibacterial products are appropriate for routine use. To reduce the opportunity for cross-contamination, liquid or foam soap products should be selected rather than bar soaps. Refillable dispensers should be completely emptied, cleaned, and then refilled to prevent creation of a bacterial reservoir. Moisturizing soaps can preserve skin integrity and encourage compliance with hand hygiene protocols among veterinary staff. Dry, cracked skin is painful, and indicates skin barrier disruption.

Hands should be washed between animal contacts and after contact with feces, blood, body fluids, and exudates. Staff members who have animal contact should not wear artificial nails and should keep fingernails short.61,65 Wearing rings may reduce the effectiveness of hand hygiene.61 Hand washing should focus on thorough cleaning of all hand surfaces.

The correct technique for hand washing is as follows66:

  • • Wet hands with running water.

  • • Place soap in palms.

  • • Rub hands together to make a lather.

  • • Scrub hands vigorously for 20 seconds.

  • • Rinse soap off hands.

  • • Dry hands with a disposable towel.

  • • Turn off faucet using the disposable towel as a barrier.

Alcohol-based hand rubs are highly effective against bacteria and enveloped viruses and may be used if hands are not visibly soiled.61,67,68 However, hand rubs are less effective against some nonenveloped viruses (eg, norovirus, rotavirus, and parvovirus), bacterial spores (eg, Bacillus anthracis and Clostridium difficile), or protozoal parasites (eg, cryptosporidia).61,68,69

The correct technique for use of hand rubs is as follows 61:

  • • Apply alcohol-based hand rub to palm of 1 hand.

  • • Cover all surfaces of hands and fingers.

  • • Continue to rub hands together until dry.

When running water is not available, the mechanical action of a moist wipe may enhance the effectiveness of an alcohol-based hand rub, especially when hands are visibly soiled. In sole use, moist wipes are not as effective as alcohol-based hand rubs or washing hands with soap and running water.61

2. USE OF GLOVES AND SLEEVES

Gloves reduce the risk of pathogen transmission by providing barrier protection. Nevertheless, wearing gloves (including sleeves) is not a substitute for hand washing.70,71 Wearing gloves is not necessary when examining or handling healthy animals. Gloves should be worn when an animal has evidence of disease or its medical history is unknown and worn routinely when contact with feces, blood, body fluids, secretions, excretions, exudates, and nonintact skin is likely. Gloves should also be worn when cleaning cages, litter boxes, and environmental surfaces.

Gloves should be changed between examinations of individual animals or animal groups (eg, litters of puppies or kittens, groups of cattle), between dirty and clean procedures performed on a single patient, and whenever torn. Gloves should be removed promptly after use, and contact between skin and the outer glove surface should be avoided. Disposable gloves should not be washed and reused.72,73 Immediately after glove removal, hands should be washed because gloves can have undetected perforations or hands may be contaminated unknowingly during glove removal.

Gloves are available in a variety of materials. Choice of gloves depends on their intended use. If allergic reactions to latex are a concern, acceptable alternatives include nitrile or vinyl gloves. Further information regarding prevention of allergic reactions to natural rubber in the workplace is provided by NIOSH.74

3. FACIAL PROTECTION

Facial protection prevents exposure of mucous membranes of the eyes, nose, and mouth to infectious materials. Facial protection should be used whenever exposures to splashes or sprays are likely to occur,4,53,75 such as those generated during lancing of abscesses, flushing wounds, dentistry, nebulization, suctioning, lavage, and necropsy.

Facial protection includes a surgical mask worn with goggles or a face shield. Surgical masks provide adequate protection during most veterinary procedures that generate potentially infectious large droplets.

4. RESPIRATORY TRACT PROTECTION

Respiratory tract protection is designed to protect the airways of the wearer from infectious agents that are transmitted via inhalation of small particles. Although the need for this type of protection is limited in veterinary medicine, it may be appropriate in certain situations, such as during investigations of abortion storms in small ruminants (Q fever), abnormally high mortality rates among poultry (avian influenza), respiratory disease in an M bovis–positive herd (bovine tuberculosis), and ill psittacines (avian chlamydiosis).

Disposable particulate respirators often resemble surgical or dust masks but fit closely to the wearer's face and are designed to filter smaller particles (surgical masks are not designed to prevent inhalation of small particles). A variety of inexpensive respirators, such as the commonly used NIOSH-certified N95 respirator (designed to filter at least 95% of airborne particles) are readily available.76 Fit-testing is necessary to ensure an effective seal between a respirator and the wearer's face. Additional information about respirators, fit-testing, and the OSHA Respiratory Protection Standard is provided by NIOSH and OSHA.76,77

5. PROTECTIVE OUTERWEAR
a. Laboratory coats, smocks, and coveralls

Laboratory coats, smocks, and coveralls are designed to protect street clothes or scrubs from contamination. They are generally not fluid resistant, so they should not be used in situations where splashing or soaking with potentially infectious liquids is anticipated. Garments should be changed promptly whenever they become visibly soiled or contaminated with feces or body fluids. For most personnel, outerwear should be changed and laundered daily. These garments should not be worn outside of the work environment.4,78,79

b. Nonsterile gowns

Gowns provide better barrier protection than laboratory coats. Permeable gowns can be used for general care of animals in isolation. Impermeable gowns should be used when splashes or large quantities of body fluids are present or anticipated. Disposable gowns should not be reused. Reusable fabric gowns may be used repeatedly to care for the same animal in isolation, but should be laundered between contacts with different patients or whenever soiled. Use of gloves is indicated whenever gowns are worn, and the outer (contaminated) surface of a gown should only be touched with gloved hands. Gowns and gloves should be removed and placed in the laundry or refuse bin before leaving the animal's environment. Hands should be washed immediately afterwards.53

To avoid cross-contamination, gowns should be removed as follows:

  • • After unfastening ties, peel the gown from the shoulders and arms by pulling on the chest surface with gloved hands.

  • • Remove the gown, avoiding contact between its outer surface and clean surfaces.

  • • Wrap the gown into a ball for disposal while keeping the contaminated surface on the inside.

  • • Remove gloves and wash hands.

  • • If body fluids have soaked through the gown, promptly remove the contaminated clothing and wash the skin.

c. Footwear

Footwear should be suitable for the specific working conditions (eg, rubber boots for farm work) and should protect personnel from exposure to infectious material as well as from trauma. Recommendations include shoes or boots with thick soles and closed-toe construction that are impermeable to liquid and easy to clean. Footwear should be cleaned to prevent transfer of infectious material from one environment to another, such as between farm visits and before returning from a field visit to a veterinary facility or home. Disposable shoe covers or booties add an extra level of protection when heavy quantities of infectious materials are present or expected.

d. Head covers

Disposable head covers provide a barrier when gross contamination of the hair and scalp is expected. Disposable head covers should not be reused.

6. BITE AND OTHER ANIMAL-RELATED INJURY PREVENTION

Veterinary personnel should take all necessary precautions to prevent animal-related injuries. Preventive measures include use of physical restraints, bite-resistant gloves, muzzles, sedation or anesthesia, and reliance on experienced veterinary personnel rather than owners to restrain animals.80 Request that owners notify veterinary personnel before contact is initiated if the animal is aggressive. Aggressive tendencies and bite history should be recorded and communicated to personnel. Practitioners should remain alert for changes in their patients' behavior. Veterinary personnel working with large animals should have an escape route in mind at all times.1,42

B. PROTECTIVE ACTIONS DURING VETERINARY PROCEDURES:

1. PATIENT INTAKE

Waiting rooms should be a safe environment for clients, animals, and employees.

Aggressive animals and those that have a potentially communicable disease should be placed directly into an examination room. Animals with respiratory or gastrointestinal signs or that have a history of exposure to a known infectious agent should be brought through an entrance other than the main entrance.81 If possible, an examination room should be designated for animals with potentially infectious diseases.

2. EXAMINATION OF ANIMALS

All veterinary personnel should wash their hands between examinations of individual animals or animal groups (eg, litters of puppies or kittens, groups of cattle). Routine hand hygiene is the most effective way to prevent transmission of zoonotic diseases. Every examination room should have a source of running water, a soap dispenser, and paper towels. Alcohol-based hand rubs may be provided for use in conjunction with hand washing.

Veterinary personnel should wear protective outerwear and use gloves and other protective equipment appropriate for the situation. Animals with potentially infectious diseases should be examined in a dedicated examination room and should remain there until initial diagnostic procedures and treatments have been performed.

3. INJECTIONS, VENIPUNCTURE, AND ASPIRATION PROCEDURES
a. Needlestick injury prevention

Needlestick injuries are of concern in veterinary medical settings because they can result in the inoculation of live vaccines or infective aspirate materials. Additionally, skin breaks from needlesticks can act as a portal of entry for environmental pathogens. The risk of exposure to blood-borne pathogens from needlestick injuries is inherently different in veterinary medicine than in human medicine. Contact with animal blood (except primate blood) has not been reported as a source of occupationally acquired infection; nevertheless, percutaneous and mucosal exposure to blood and blood products should be avoided.

After injection of vaccines containing live organisms or aspiration of body fluids or tissue, the used syringe with the attached needle should be placed in a sharps container (a container designed for safe collection of medical articles that may cause punctures or cuts to those handling them). Although not ideal, following most other veterinary procedures, the needle and syringe may be separated for disposal of the needle in the sharps container. This can be most safely accomplished by use of the needle removal device on the sharps container, which allows the needle to drop directly into the container. Alternatively, the needle may be removed from the syringe by use of forceps. Uncapped needles should never be removed from the syringe by hand. In addition, needle caps should not be removed by mouth.

Punctureand leak-proof sharps containers should be located in every area in which animal care occurs.82–84 After disposal, sharps should not be transferred from one container to another. Devices that cut needles prior to disposal should not be used because they increase the potential for aerosolization of the contents.82

When it is absolutely necessary to recap needles as part of a medical procedure or protocol, a forceps can be used to replace the cap on the needle or a 1-handed scoop technique may be employed as follows85:

  • • Place the cap on a horizontal surface.

  • • Hold the syringe with attached needle in 1 hand.

  • • Use the needle to scoop up the cap without use of the other hand.

  • • Tighten the cap by pushing it against a hard surface.

b. Barrier protection

Gloves should be worn during venipuncture of animals suspected of having an infectious disease and when performing soft tissue aspiration procedures. Currently, there are no data indicating that venipuncture of healthy animals constitutes an important risk of exposure to pathogens.

4. DENTAL PROCEDURES

Dental procedures create splashes or sprays of saliva and blood that are potentially infectious. There is also the potential for cuts and abrasions from dental equipment and teeth. Veterinary personnel performing the dental procedure and anyone in range of direct splashes or sprays should wear protective outerwear, gloves, and facial protection.86 In 1 study in humans, irrigation of the oral cavity with a 0.12% chlorhexidine solution significantly decreased bacterial aerosolization.87

5. RESUSCITATION

The urgent nature of resuscitation increases the likelihood that breaches in infection control will occur. Barrier precautions, such as use of gloves and facial protection, should be applied to prevent exposure to zoonotic infectious agents that may be present. Never blow into the nose or mouth of an animal or into an endotracheal tube for purposes of resuscitation; instead, intubate the animal and use a manual resuscitator or an anesthesia machine or ventilator.

6. OBSTETRICS

Common zoonotic agents, including Brucella spp, C burnetii, and Listeria monocytogenes, may be found in high concentrations in the birthing fluids of aborting or parturient animals and in stillborn fetuses and neonates.88 Gloves, sleeves, facial protection, and impermeable protective outerwear should be used as needed to prevent exposures to potentially infective materials. Never attempt to resuscitate a nonrespiring neonate by blowing directly into its nose or mouth.

7. NECROPSY

Necropsy is a high-risk procedure because of potential contact with infectious agents in body fluids and aerosols and on contaminated sharps.75 Nonessential persons should not be present during necropsy procedures. Veterinary personnel should wear gloves, facial protection, and impermeable protective outerwear as needed. In addition, cut-proof gloves should be used to prevent sharps-associated injuries. Respiratory tract protection and environmental controls should be employed when band saws or other power equipment are used.

8. DIAGNOSTIC-SPECIMEN HANDLING

Feces, urine, aspirates, and swabs should be handled as though they contained infectious organisms. Protective outerwear and disposable gloves should be worn when handling these specimens. Discard gloves and wash hands before touching clean items (eg, medical records or telephones). Eating and drinking must not be allowed in the laboratory.

C. ENVIRONMENTAL INFECTION CONTROL:

1. ISOLATION OF ANIMALS WITH INFECTIOUS DISEASES

A single-purpose isolation room is recommended for the care and housing of animals with potentially communicable diseases. A designated examination room that can be easily emptied of nonessential equipment and cleaned and disinfected can be transformed into an isolation room. A cage may be brought in for the animal. If an isolation room has a negative pressure air-handling system, the air should be exhausted outside of the building away from animal and public access areas, employee break areas, and air-intake vents.4,89 Air pressures should be monitored daily while in use.

The isolation room should have signage indicating that the animal may have an infectious disease and detailing what precautions should be taken.53 Access to the room should be limited, and a sign-in sheet should be used to monitor all people entering the isolation area.

Only the equipment and materials needed for the care and treatment of the patient should be kept in the isolation room. Items intended for use in the isolation room should remain there; if necessary, replacement items should be procured for use elsewhere in the hospital. Items in the isolation area should be disassembled, cleaned, and disinfected prior to removal. Use of disposable articles minimizes exposure of personnel to potentially infective materials. Potentially contaminated materials should be bagged before transport within the practice and disinfected or disposed of according to their level of hazard.53,84

Limited data are available regarding the efficacy of shoe covers and footbaths for infection control in veterinary settings. When shoe or boot coverings are used, personnel should be trained to use, remove, and dispose of them properly because improper use or disposal may increase the risk of exposure to pathogens. When a disinfectant footbath is in use, it should be placed just inside the door of the isolation area so that personnel step through it before departing the room.90 Footbath disinfectant should be changed daily or when visibly dirty.

2. CLEANING AND DISINFECTION OF EQUIPMENT AND ENVIRONMENTAL SURFACES

Environmental surfaces and equipment should be cleaned and disinfected between uses or whenever visibly soiled. Surfaces in areas where animals are housed, examined, or treated should be made of nonporous, easily cleaned materials. During cleaning, adequate ventilation should be provided; generation of dust that may contain pathogens can be minimized by use of central vacuum units, wet mopping, dust mopping, or electrostatic sweeping. Surfaces may be lightly sprayed with water prior to mopping or sweeping. Facial protection and control of splatter can minimize exposure to aerosols generated by brushing during cleaning activities. Highpressure sprayers may aerosolize and disseminate infectious small particles, and their use should be limited.

Gross contamination must be removed before disinfection because organic material decreases the effectiveness of most disinfectants.91 To maximize effectiveness, disinfectants should be used according to manufacturers' instructions; check label for proper dilution and contact time. Personnel engaged in cleaning and disinfection should be trained in safe practices and provided necessary safety equipment according to the product's material safety data sheet.

Routine dish washing of food and water bowls is adequate for hospitalized patients with infectious diseases,4 although use of disposable dishes should be considered for animals in isolation. Toys, litter boxes, and other miscellaneous items should be discarded or cleaned and disinfected between patient uses. Litter boxes should be cleaned or disposed of at least daily by a nonpregnant staff member. Clean items should be kept separate from dirty items.

3. HANDLING OF LAUNDRY

Although soiled laundry may be contaminated with pathogens, the risk of disease transmission is negligible if handled correctly. Personnel should check for sharps before items are laundered. Gloves and protective outerwear should be worn when handling soiled laundry. Bedding and other laundry should be machine washed with standard laundry detergent and machine dried. To prevent cross-contamination, separate storage and transport bins should be used for clean and dirty laundry. If soiled clothing is laundered at home, it should be transported in a sealed plastic bag and put directly into a washing machine.

4. DECONTAMINATION AND SPILL RESPONSE

Spills and splashes of blood, body fluids, or potentially infective substances should be immediately sprayed with disinfectant and contained with absorbent material (eg, paper towels, sawdust, or cat litter). Personnel should wear gloves and other appropriate protective equipment before beginning the cleanup. The spilled fluids and absorbent material should be picked up and sealed in a leak-proof plastic bag, and the area should be cleaned and disinfected. Animals and people who are not involved in the cleanup should be kept away from the area until disinfection is completed.89

5. VETERINARY MEDICAL WASTE

Medical waste is defined and regulated at the state level by multiple agencies but may include sharps, tissues, contaminated materials, and dead animals.84,92 The AVMA recommends voluntary compliance with the OSHA Bloodborne Pathogen Standard93 regarding medical waste. It is beyond the scope of this Compendium to describe veterinary medical waste management in detail; for guidance, local or state health departments and municipal governments should be consulted. Additional information regarding state regulating agencies is available from the Environmental Protection Agency.94

6. RODENT AND VECTOR CONTROL

Many important zoonotic pathogens are transmitted by insect vectors or rodents. Integrated pest management is a comprehensive approach used to prevent and control pests.95,96 Measures included in integrated pest management are as follows:

  • • Seal potential entry and exit points into buildings; common methods include the use of caulk, steel wool, or metal lath under doors and around pipes.

  • • Store food and garbage in metal or thickplastic containers with tight lids.

  • • Dispose of food waste promptly.

  • • Eliminate potential rodent nesting sites (eg, clutter or hay and food storage).

  • • Maintain rodent traps in the facility and check daily.

  • • Remove sources of standing water (eg, empty buckets, tires, and clogged gutters) from around the building to reduce potential mosquito breeding sites.

  • • Install and maintain window screens to prevent entry of insects and rodents into buildings.

Additional measures may be warranted for control of specific pests. For example, bats should be excluded from hospital barns and veterinary facilities. Veterinary facility managers may wish to contact a pest control company for additional guidance.

7. OTHER ENVIRONMENTAL CONTROLS

It is important to designate staff areas for eating, drinking, or smoking that are separate from patient care areas. Separate and appropriately labeled refrigerators should be used for food for humans, food for animals, and biologics. Dishware for human use should be cleaned and stored away from animal-care areas.

IV. EMPLOYEE HEALTH

A. GENERAL:

Veterinary practice managers should promote infection control as part of a comprehensive employee health program. Senior management support is essential for staff compliance with policies and procedures.97,98

In addition to maintaining up-to-date emergency contact information, veterinary practices should maintain staff records including details of vaccinations, rabies virus antibody titers, and exposures to infectious organisms to expedite care following occupational health incidents.99,100 Employee health records should be collected on a voluntary basis, with a clear understanding that confidentiality will be maintained. Health-related issues that may influence employees' work duties should be documented in personnel files. Employees should inform their supervisor of changes in health status, such as pregnancy, that may affect work duties. Veterinary personnel should inform their health-care provider that their work duties involve animal contact.

1. EMPLOYEE VACCINATION POLICIES AND RECORD KEEPING
a. Rabies

Veterinary personnel who have contact with animals should be offered preexposure vaccination in accordance with recommendations of the ACIP.101 Preexposure vaccination consists of 3 doses of a human rabies vaccine; after the first dose (given on day 0), subsequent doses are administered on day 7 and day 21 or 28. Following preexposure vaccination, the ACIP guidelines recommend that rabies virus antibody titers be checked every 2 years for individuals in the frequent risk category, which includes most veterinary personnel in the United States. Preexposure vaccination against rabies does not eliminate the need for appropriate treatment following a known rabies virus exposure, but it does simplify the postexposure treatment regimen (2 doses of vaccine without administration of human rabies immune globulin for preexposure-vaccinated individuals vs 5 doses of vaccine with administration of human rabies immune globulin for individuals who were not previously vaccinated). In addition, preexposure vaccination may protect against unrecognized rabies exposures or when postexposure treatment is delayed.101

b. Tetanus

Veterinary personnel should be vaccinated against tetanus every 10 years in accordance with ACIP recommendations.102

c. Influenza

Veterinary personnel, especially those working with poultry or swine, are encouraged to receive the current influenza virus vaccine. This is intended to minimize the small possibility that dual infection of an individual with human and either avian or swine influenza viruses could result in a new strain of influenza virus.103–106

2. MANAGEMENT AND DOCUMENTATION OF EXPOSURE INCIDENTS

Display incident response procedures prominently. First aid should be readily available, and personnel should be trained to recognize and respond to emergency situations. Following the administration of first aid, strongly encourage affected persons to contact an appropriate health-care provider.

Injuries or potential exposures to zoonotic pathogens should be reported, investigated, and documented. Practice managers should develop policies that encourage reporting.100 An incident report form, such as OSHA form 300, should include details as follow:

  • • Date, time, and location of the incident.

  • • Name of person injured or exposed.

  • • Names of other persons present.

  • • Description of the incident.

  • • Whether or not a health-care provider was consulted.

  • • Status of the animal involved (vaccination status, clinical condition, and any diagnostic test results [or tests pending]).

  • • Documentation of any report to public health authority.

  • • Plans for follow-up.

Practice managers should contact their local or state health department to inquire about mandatory reporting of bite incidents and zoonotic disease exposures.

3. STAFF TRAINING AND EDUCATION

Staff training at the beginning of employment and at least annually is an essential component of an effective employee health program. Training should emphasize infection control practices, the potential for zoonotic disease exposure, hazards associated with work duties, and injury prevention. It should also include instruction in animal handling, restraint, and behavioral cue recognition. Additional in-service training should be provided as recommendations change or as problems with infection control policies are identified. Staff participation in training should be documented.

B. IMMUNOCOMPROMISED PERSONNEL:

Immunocompromised personnel are more susceptible to infection with zoonotic agents and more likely to develop serious complications from zoonotic infections.107 Immune responses may be suppressed by conditions, including HIV/AIDS, diabetes mellitus, asplenia, pregnancy, certain malignancies, or congenital abnormalities. Certain treatments (eg, administration of corticosteroids, chemotherapeutic agents, and immunosuppressive drugs) and radiation therapy may also suppress immunity. Potentially immunocompromised personnel and their supervisors should be aware that workplace activities with a higher risk of exposure to zoonotic pathogens include processing of laboratory samples and direct patient care, especially care of high-risk animals.66 These include animals that are young, parturient, unvaccinated, stray or feral, fed raw meat diets, or housed in crowded conditions (eg, shelters); animals with internal or external parasites; wildlife; reptiles and amphibians; and exotic or nonnative species.66

Although data regarding the risks of zoonotic infection for HIV-infected persons employed in veterinary settings are limited, there are none that justify their exclusion from the veterinary workplace.108 Risk of exposure to zoonotic pathogens in the workplace can be mitigated with appropriate infection control measures.108

During pregnancy, physiologic suppression of cell-mediated immunity occurs, which increases a woman's susceptibility to certain infectious diseases, such as toxoplasmosis, lymphocytic choriomeningitis, brucellosis, listeriosis, and psittacosis.109 Vertical transmission of certain zoonotic agents may result in spontaneous abortion, stillbirth, premature birth, or congenital anomalies.

Employees with immune dysfunction should discuss their health status with the practice manager so appropriate workplace accommodations can be made. It may be advisable to consult the employee's health-care provider or an infection control, public health, or occupational health specialist.110 Employers must abide by state and federal laws that protect pregnant women and persons with disabilities. Employees must be assured that confidential information will not be disclosed to others.

V. CREATING A WRITTEN INFECTION CONTROL PLAN

All veterinary practices should have a written infection control plan that is reviewed and updated at least annually. A model infection control plan that can be tailored to individual practice needs is available (Appendix 3).

Effective infection control plans should do the following:

  • • Reflect the principles of infection control outlined in this Compendium.

  • • Be specific to the facility and practice type.

  • • Be flexible so that new issues can be addressed easily and new knowledge incorporated.

  • • Provide explicit and well-organized guidance.

  • • Clearly describe the infection control responsibilities of staff members.

  • • Include a process for the evaluation of infection control practices.

  • • Provide contact information, resources, and references (eg, reportable disease list, public health contacts, local rabies codes and environmental health regulations, OSHA requirements, Web sites of interest, and client education materials).

A. INFECTION CONTROL PERSONNEL:

Designated staff members should be responsible for development and implementation of infection control policies, monitoring compliance, maintenance of records, and management of workplace exposures and injury incidents. Additional personnel should be assigned responsibility for completion of infection control activities in support of the plan.

B. COMMUNICATING AND UPDATING THE INFECTION CONTROL PLAN:

1. AVAILABILITY

Copies of the infection control plan and resource documents should be kept at locations that are readily accessible to all staff, including reception, administrative, animal-care, housekeeping, and veterinary medical personnel.

2. LEADERSHIP

Senior and managerial personnel should set the standard for infection control practices, emphasize the importance of infection control to other staff, and reference the infection control plan in daily activities.

3. NEW STAFF

New staff members should be given a copy of the infection control plan. Detailed training on the practice's infection control policies and procedures, employee vaccination recommendations, and incident reporting should be provided. Receipt of the plan and training should be documented for each employee.

4. CONTINUING EDUCATION

Infection control procedures should be reviewed at least annually at staff meetings, and regular continuing education on zoonotic disease topics should be encouraged.

5. REVIEW AND REVISION

A designated staff person should review and revise the infection control plan when new information becomes available or clinical practices change. Revisions should be shared with all staff members, and all copies of the plan should be updated.

6. COMPLIANCE

A designated staff person should ensure that infection control policies and protocols are carried out consistently and correctly and that corrective measures and employee retraining are instituted when deficiencies are identified.

ABBREVIATIONS

ACIP

Advisory Committee on Immunization Practices

NASPHV

National Association of State Public Health Veterinarians

NIOSH

National Institute of Occupational Safety and Health

OSHA

Occupational Safety and Health Administration

VICC

Veterinary Infection Control Committee

VSP

Veterinary Standard Precautions

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Appendix 1

Zoonotic diseases of importance in the United States, 2008.

DiseaseAgentMeans of transmission to humansMost common species associated with transmission to humans111–113Nationally notifiable for human (H) or animal (A)casesSevere or prolonged infection usually associated with immunosuppressionDeaths in humans reported
Acariasis (mange)Sarcoptes scabiei, Notoedres cati, and other species of mitesContactDogs, cats, horses, goats, sheep, swine, birdsNoNoNo
AnthraxBacillus anthracisContact, aerosol, vectorCattle, sheep, goats, horsesH, ANoYes
Avian influenzaHighly pathogenic avian influenza virusesContact, aerosolPoultry, pet birdsH, ANoYes
BabesiosisBabesia microti and other speciesVectorCattle, rodentsAYesYes
BaylisascariasisBaylisascaris procyonisContactRaccoonsNoNoYes
Bordetella bronchiseptica infectionBordetella bronchisepticaAerosolDogs, swine, rabbits, guinea pigsNoYesNo
BrucellosisBrucella melitensis, Brucella abortus, Brucella suis, Brucella canisContact, aerosolGoats, cattle, swine, dogs, horsesH, ANoYes
CampylobacteriosisCampylobacter jejuni, Campylobacter fetus, Campylobacter coliContactCattle, sheep, goats, swine, dogs, cats, birds, mink, ferrets, hamstersNoNoRare
Capnocytophaga canimorsus infectionCapnocytophaga canimorsus, Capnocytophaga cynodegmiContactDogs, catsNoYesYes
Cat scratch diseaseBartonella henselaeContactCatsNoYesRare
Chlamydiosis (mammalian)Chlamydophila abortus, Chlamydophila felisAerosol, contactSheep, goats, llamas, cats, cattleNoNoYes
Contagious pustular dermatitis (or for contagious ecthyma)ParapoxvirusContactSheep, goatsNoNoNo
CryptococcosisCryptococcus neoformansAerosolPigeons, other birdsNoYesYes
CryptosporidiosisCryptosporidium parvumContactCattle (typically calves)HYesYes
DermatophilosisDermatophilus congolensisContact, vectorGoats, sheep, cattle, horsesNoNoNo
Dermatophytosis (ringworm)Microsporum spp, Trichophyton spp, Epidermophyton sppContactCats, dogs, cattle, goats, sheep, horses, lagomorphs, rodentsNoYesNo
Dipylidium infection (tapeworm)Dipylidium caninumVectorDogs, catsNoNoNo
Escherichia coli 0157:H7 infectionEscherichia coli 0157:H7ContactCattle, goats, sheep, deerNoNoYes
EchinococcosisEchinococcus granulosus, Echinococcus multilocularisContactDogs, cats, wild canidsANoYes
Ehrlichiosis or anaplasmosisEhrlichia and Anaplasma sppVectorDeer, rodents, horses, dogsHYesYes
Equine encephalomyelitisTogaviridae (eastern, western, and Venezuelan equine encephalomyelitis viruses)VectorBirds, horsesH, ANoYes
ErysipeloidErysipelothrix rhusiopathiaeContactSwine, poultry, fish, crustaceans, No mollusksNoYes
GiardiasisGiardia intestinalis (Giardia lamblia)ContactThought to be highly species-specific and rarely transmitted from animals to humansHYesNo
Hantaviral diseasesHantavirusesAerosolRodentsHNoYes
Herpes B virus infectionCercopithecine herpesvirus 1ContactMacaque monkeysNoNoYes
Influenza AInfluenza A virusContact, aerosolPoultry, swineH, ANoYes
Larval migrans: cutaneous (hookworm)Ancylostoma sppContactDogs, catsNoNoRare
Larval migrans: visceral, ocular, neurologic (roundworm)Toxocara canis, Toxocara catiContactDogs, catsNoNoRare
LeishmaniasisLeishmania sppVectorDogs, wild canidsANoYes
LeptospirosisLeptospira sppContact, aerosolRodents, swine, cattle, sheep, goats, horses, dogsANoYes
ListeriosisListeria monocytogenesContactCattle, sheep, goats, swine, birds, dogs, catsHYesYes
Lyme diseaseBorrelia burgdorferiVectorSmall rodents, wild mammalsHNoNo
Lymphocytic choriomeningitisArenavirus (lymphocytic choriomeningitis virus)Contact, aerosolMice, hamsters, guinea pigsNoYesYes
MonkeypoxOrthopoxvirusContact, aerosolNonhuman primates, rodentsANoYes
Mycobacterial infection (nontuberculous)Mycobacterium avium complex, Mycobacterium marinumAerosol, contactPoultry, birds, aquarium fish, reptilesNoYesYes
PasteurellosisPasteurella multocida and other speciesContactDogs, cats, rabbits, rodentsNoYesNo