Evaluation of microbial culture of pooled fecal samples for detection of Mycobacterium avium subsp paratuberculosis in large dairy herds

Saraya Tavornpanich, Ian Gardner, Randall J. Anderson, Sang Shin, Robert H. Whitlock, Terry Fyock, John M Adaska, Richard L. Walker, Sharon K. Hietala

Research output: Contribution to journalArticle

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Abstract

Objective - To evaluate sensitivity of microbial culture of pooled fecal samples for detection of Mycobacterium avium subsp paratuberculosis (MAP) in large dairy herds and assess the use of the method for estimation of MAP prevalence. Animals - 1,740 lactating cows from 29 dairy herds in California. Procedure - Serum from each cow was tested by use of a commercial ELISA kit. Individual fecal samples were cultured and used to create pooled fecal samples (10 randomly selected fecal samples/pool; 6 pooled samples/herd). Sensitivity of MAP detection was compared between Herrold's egg yolk (HEY) agar and a new liquid culture method. Bayesian methods were used to estimate true prevalence of MAP-infected cows and herd sensitivity. Results - Estimated sensitivity for pooled fecal samples among all herds was 0.69 (25 culture-postive pools/36 pools that were MAP positive). Sensitivity increased as the number of culture-positive samples in a pool increased. The HEY agar method detected more infected cows than the liquid culture method but had lower sensitivity for pooled fecal samples. Prevalence of MAP-infected cows was estimated to be 4% (95% probability interval, 2% to 6%) on the basis of culture of pooled fecal samples. Herd-level sensitivity estimate ranged from 90% to 100% and was dependent on prevalence in the population and the sensitivity for culture of pooled fecal samples. Conclusions and Clinical Relevance - Use of pooled fecal samples from 10 cows was a cost-effective tool for herd screening and may provide a good estimate of the percentage of MAP-infected cows in dairy herds with a low prevalence of MAP.

Original languageEnglish (US)
Pages (from-to)1061-1070
Number of pages10
JournalAmerican Journal of Veterinary Research
Volume65
Issue number8
DOIs
StatePublished - Aug 2004

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Mycobacterium avium subsp. paratuberculosis
Mycobacterium avium
paratuberculosis
dairy herds
cows
herds
sampling
Egg Yolk
Agar
egg yolk
Bayes Theorem
microbial culture
agar
liquids
Enzyme-Linked Immunosorbent Assay
Bayesian theory
methodology
Costs and Cost Analysis

ASJC Scopus subject areas

  • veterinary(all)

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Evaluation of microbial culture of pooled fecal samples for detection of Mycobacterium avium subsp paratuberculosis in large dairy herds. / Tavornpanich, Saraya; Gardner, Ian; Anderson, Randall J.; Shin, Sang; Whitlock, Robert H.; Fyock, Terry; Adaska, John M; Walker, Richard L.; Hietala, Sharon K.

In: American Journal of Veterinary Research, Vol. 65, No. 8, 08.2004, p. 1061-1070.

Research output: Contribution to journalArticle

Tavornpanich, Saraya ; Gardner, Ian ; Anderson, Randall J. ; Shin, Sang ; Whitlock, Robert H. ; Fyock, Terry ; Adaska, John M ; Walker, Richard L. ; Hietala, Sharon K. / Evaluation of microbial culture of pooled fecal samples for detection of Mycobacterium avium subsp paratuberculosis in large dairy herds. In: American Journal of Veterinary Research. 2004 ; Vol. 65, No. 8. pp. 1061-1070.
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abstract = "Objective - To evaluate sensitivity of microbial culture of pooled fecal samples for detection of Mycobacterium avium subsp paratuberculosis (MAP) in large dairy herds and assess the use of the method for estimation of MAP prevalence. Animals - 1,740 lactating cows from 29 dairy herds in California. Procedure - Serum from each cow was tested by use of a commercial ELISA kit. Individual fecal samples were cultured and used to create pooled fecal samples (10 randomly selected fecal samples/pool; 6 pooled samples/herd). Sensitivity of MAP detection was compared between Herrold's egg yolk (HEY) agar and a new liquid culture method. Bayesian methods were used to estimate true prevalence of MAP-infected cows and herd sensitivity. Results - Estimated sensitivity for pooled fecal samples among all herds was 0.69 (25 culture-postive pools/36 pools that were MAP positive). Sensitivity increased as the number of culture-positive samples in a pool increased. The HEY agar method detected more infected cows than the liquid culture method but had lower sensitivity for pooled fecal samples. Prevalence of MAP-infected cows was estimated to be 4{\%} (95{\%} probability interval, 2{\%} to 6{\%}) on the basis of culture of pooled fecal samples. Herd-level sensitivity estimate ranged from 90{\%} to 100{\%} and was dependent on prevalence in the population and the sensitivity for culture of pooled fecal samples. Conclusions and Clinical Relevance - Use of pooled fecal samples from 10 cows was a cost-effective tool for herd screening and may provide a good estimate of the percentage of MAP-infected cows in dairy herds with a low prevalence of MAP.",
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