Comparison of diagnostic methods for detection of active infection with Tritrichomonas foetus in beef heifers

Daniel R. Kittel From the Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, CA 95616 (Kittel, Campero, Van Hoosear, BonDurant); and the National Veterinary Services Laboratory, PO Box 844, Ames, IA 50010 (Rhyan).

Search for other papers by Daniel R. Kittel in
Current site
Google Scholar
PubMed Close
 BS
,
Carlos Campero From the Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, CA 95616 (Kittel, Campero, Van Hoosear, BonDurant); and the National Veterinary Services Laboratory, PO Box 844, Ames, IA 50010 (Rhyan).

Search for other papers by Carlos Campero in
Current site
Google Scholar
PubMed Close
 DVM, PhD
,
Karen A. Van Hoosear From the Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, CA 95616 (Kittel, Campero, Van Hoosear, BonDurant); and the National Veterinary Services Laboratory, PO Box 844, Ames, IA 50010 (Rhyan).

Search for other papers by Karen A. Van Hoosear in
Current site
Google Scholar
PubMed Close
 MA
,
Jack C. Rhyan From the Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, CA 95616 (Kittel, Campero, Van Hoosear, BonDurant); and the National Veterinary Services Laboratory, PO Box 844, Ames, IA 50010 (Rhyan).

Search for other papers by Jack C. Rhyan in
Current site
Google Scholar
PubMed Close
 DVM, MS
, and
Robert H. BonDurant From the Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, CA 95616 (Kittel, Campero, Van Hoosear, BonDurant); and the National Veterinary Services Laboratory, PO Box 844, Ames, IA 50010 (Rhyan).

Search for other papers by Robert H. BonDurant in
Current site
Google Scholar
PubMed Close
 DVM
Free access

Objective

To compare sensitivity of a generic trypticase-yeast extract-maltose (TYM) medium versus a commercial nutrient medium in the diagnosis of Tritrichomonas foetus infection in heifers and to assess sensitivity when incubation of samples inoculated into commercial medium pouches is delayed overnight.

Design

Prospective study.

Animals

30 virgin beef heifers.

Procedures

20 heifers vaccinated with a trichomonad antigen and 10 unvaccinated control heifers were exposed at synchronized estrus by intravaginal instillation of 106 T foetus organisms. Cervicovaginal mucus samples were collected every other week for 10 weeks from controls and once (10 weeks after exposure) from vaccinated heifers. Samples were inoculated into both media and immediately incubated at 37 C (98.6 F). A duplicate inoculation from controls was made into commercial medium, and the pouch was shipped overnight to a diagnostic laboratory without prior incubation.

Results

For 40 of 50 samples from control heifers, there was agreement on diagnoses between media. There was agreement on a positive diagnosis for 3 of 20 samples from vaccinated heifers and on a negative diagnosis for 15 of these 20 samples. For samples shipped overnight before incubation, there were 10% fewer positive diagnoses, compared with samples incubated immediately in commercial medium and 10% more positive diagnoses, compared with samples immediately incubated in TYM.

Clinical Implications

Use of the commercial medium is a more sensitive indicator of current infection in heifers than use of generic TYM medium. In herds where infection prevalence is high, this method is likely to identify more infected females, an important consideration when control programs include culling of infected cows. (J Am Vet Med Assoc 1998;213:519-522)

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 626 186 22
PDF Downloads 78 41 2
Cover Journal of the American Veterinary Medical Association
Journal of the American Veterinary Medical Association
Issue:
15 Aug 1998
Advertisement