Use of bulk tank and milk filter cultures in screening for Streptococcus agalactiae and coagulase-positive staphylococci

The use of a single bulk tank milk culture and a single milk filter culture was studied for their suitability, as screening tests for coagulase-positive staphylococci and Streptococcus agalactiae. Bulk tank and bulk tank milk filter cultures were compared to quarter milk cultures taken from individu...

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Bibliographic Details
Published in:Journal of food protection 1991-11, Vol.54 (11), p.848-851
Main Authors: Bartlett, P.C. (Michigan State University, East Lansing, MI), Miller, G.Y, Lance, S.E, Heider, L.E
Format: Article
Language:English
Subjects:
AGENT PATHOGENE
ALIMENTOS
BOVIN
CONTAMINACION
CONTAMINATION
ENFERMEDADES DE LOS ANIMALES
GANADO BOVINO
LAIT
LECHE
MALADIE DES ANIMAUX
ORGANISMOS PATOGENOS
PRODUIT ALIMENTAIRE
STAPHYLOCOCCUS
STREPTOCOCCUS AGALACTIAE
TECHNIQUE ANALYTIQUE
TECNICAS ANALITICAS
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Summary:The use of a single bulk tank milk culture and a single milk filter culture was studied for their suitability, as screening tests for coagulase-positive staphylococci and Streptococcus agalactiae. Bulk tank and bulk tank milk filter cultures were compared to quarter milk cultures taken from individual cows at 49 Ohio dairy herds selected from all Ohio dairy herds by, a stratified random sampling scheme. Individual cow quarter milk samples were collected from a sample of all milking cows using a sampling scheme designed to detect an organism present in 2% of quarters, with 95% confidence intervals between 1 and 3%. Seventeen (35%) herds had one or more cows positive for S. agalactiae and 34 (69%) had one or more cows positive for coagulase-positive staphylococci. Using the results of individual cow sampling as the standard, the sensitivity for S. agalactiae was estimated as 23.5% for a single milk filter sample and 35.3% for a single bulk tank milk sample. The sensitivity for coagulase-positive staphylococci was estimated as 52.9% for a single milk filter culture and 41.2% for a single bulk tank milk culture. Based on these results and those of others, it appears that a single bulk tank or milk filter sample has a relatively low sensitivity for both coagulase-positive staphylococci and S. agalactiae, making these poor screening tests for the presence of these pathogens within a dairy herd
ISSN:0362-028X
1944-9097
DOI:10.4315/0362-028X-54.11.848