title: Comparison of duplicate and single quarter milk samples for the identification of intramammary infections.
abstract: Results of bacteriological culture of 5426 pairs of duplicate quarter milk samples collected were analyzed for agreement. Overall, the percentage of agreeing pairs was 98.1%. The percentage agreement by infection type was greater for the contagious pathogens, Streptococcus agalactiae (96.4%) and Staphylococcus aureus (94.2%), than for other Streptococcus spp. (81.6%) and coliform organisms (55.6%). Single quarter samples may be adequate for determining status of quarter infection with Strep. agalactiae and Staph. aureus.
authors.affiliation: Department of Veterinary Science, Pennsylvania State University, University Park 16802.
authors.forename: R J
authors.initials: RJ
authors.lastname: Erskine
authors.forename: R J
authors.initials: RJ
authors.lastname: Eberhart
mesh_terms: D000818:Animals; D002417:Cattle; D005260:Female; D008414:Mastitis, Bovine / Q000175:diagnosis* / Q000382:microbiology; D008892:Milk / Q000382:microbiology*; D013048:Specimen Handling / Q000662:veterinary*; D013203:Staphylococcal Infections / Q000175:diagnosis / Q000662:veterinary*; D013290:Streptococcal Infections / Q000175:diagnosis / Q000662:veterinary*; D013292:Streptococcus agalactiae / Q000302:isolation & purification