Objective—To evaluate the features, underlying causes,
results of diagnostic testing, and treatment of
pneumothorax in dairy cattle.
Animals—30 dairy cattle.
Procedure—Medical records of all cattle with a diagnosis
of pneumonia were reviewed. For cattle with
pneumothorax, information was obtained pertaining
to signalment, anamnesis, diagnosis, treatment, and
outcome. Survival data were compared between cattle
with pneumonia with or without pneumothorax.
Results—Pneumothorax was associated with bronchopneumonia
in 18 cattle, interstitial pneumonia in 7
cattle, pharyngeal or laryngeal trauma in 3 cattle, and
neonatal respiratory distress in 2 calves. Bovine respiratory
syncytial virus was the most commonly detected
infectious agent. Eighteen of 30 (60%) cattle survived;
8 were euthanatized and 4 died. Survival rate
was 81% for cattle with pneumonia without pneumothorax
during the same time period. Pneumothorax
was a significant risk factor for failure to survive to discharge
from the hospital for cattle with underlying
Conclusions and Clinical Relevance—Pneumothorax
in dairy cattle appears to occur most commonly in
association with chronic bronchopneumonia. Cattle of
both sexes and all ages can be affected. (J Am Vet Med
Objective—To determine whether Salmonella spp
could be isolated from the environment of free stall
dairies in Wisconsin without any history of clinical salmonellosis
and determine the serotype and antimicrobial
susceptibility of any Salmonella isolates recovered
from the environment.
Study Population—20 free stall dairies with no history
of clinical salmonellosis.
Procedures—Dairy owners completed a questionnaire
regarding management and production practices.
Multiple swab samples were obtained from
throughout the free stall facilities and submitted for
bacterial culture for Salmonella spp. Odds ratios were
calculated to compare herd-level risk factors between
dairies from which Salmonella organisms were isolated
and herds from which Salmonella organisms were
Results—Salmonella organisms were isolated from 9 of
the 20 (45%) dairies. Salmonella serotype Meleagridis
was isolated from 4 dairies, S Meleagridis and S
Kentucky were isolated from 2 dairies, S Meleagridis and
S Cyprus were isolated from 1 dairy, S Cerro was isolated
from 1 dairy, and S Corvallis was isolated from 1
dairy. All isolates were susceptible to all antimicrobial
agents tested. None of the potential risk factors analyzed
demonstrated a significant association with an
increased likelihood of isolating Salmonella spp.
Conclusions and Clinical Relevance—Environmental
Salmonella contamination was demonstrated on free
stall dairies with no history of clinical salmonellosis.
(J Am Vet Med Assoc 2004;225:574–577)