Microbiological Results From Milk Samples Obtained Premilking and Postmilking for the Diagnosis of Bovineintramammary Infections

Document Type

Article

Journal/Book Title/Conference

Journal of Dairy Science

Volume

74

Issue

12

Publisher

NCBI

Publication Date

1991

First Page

4183

Last Page

4188

Abstract

Bacteriological culture results were compared between 336 pairs of quarter milk samples collected premilking and postmilking. Using a positive result on either premilking or postmilking samples as the definitive diagnosis, premilking sampling sensitivity was 91% for Staphylococcus aureus, 91% for coagulase-negative staphylococci, and 97% for Streptococcus other than agalactiae. Postmilking sampling sensitivities were 81, 45, and 58%, respectively, for the same pathogens. Requiring both premilking and postmilking samples for the definitive diagnosis, specificities were 92, 86, and 95% for premilking sampling alone and 96, 98, and 99% for postmilking sampling alone. Such differences in specificity would result in major differences in predictive value of a positive culture for herds with a low prevalence. Multiple isolates were significantly more common from premilking samples.

Comments

J Dy Sci 74:12:4183-4188, 1991

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