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Bovine subclinical mastitis caused by different types of coagulase-negative staphylococci

B.-M. Thorberg^*, M.-L. Danielsson-Tham, U. Emanuelson and K. Persson Waller^,,1

^* Swedish University of Agricultural Sciences, Department of Biomedical Sciences and Veterinary Public Health, SE-75007 Uppsala, Sweden
Örebro University, Department of Restaurant and Culinary Arts, SE-71260 Grythyttan, Sweden
Swedish University of Agricultural Sciences, Department of Clinical Sciences, SE-75007 Uppsala, Sweden
National Veterinary Institute, Department of Animal Health and Antimicrobial Strategies, SE-75189 Uppsala, Sweden

¹ Corresponding author: Karin.Persson-Waller{at}sva.se

Subclinical mastitis caused by intramammary infections (IMI) with coagulase-negative staphylococci (CNS) is common in dairy cows and may cause herd problems. Control of CNS mastitis is complicated by the fact that CNS contain a large number of different species. The aim of the study was to investigate the epidemiology of different CNS species in dairy herds with problems caused by subclinical CNS mastitis. In 11 herds, udder quarter samples were taken twice 1 mo apart, and CNS isolates were identified to the species level by biochemical methods. The ability of different CNS species to induce a persistent infection, and their associations with milk production, cow milk somatic cell count, lactation number, and month of lactation in cows with subclinical mastitis were studied. Persistent IMI were common in quarters infected with Staphylococcus chromogenes, Staphylococcus epidermidis, and Staphylococcus simulans. The results did not indicate differences between these CNS species in their association with daily milk production, cow milk somatic cell count, and month of lactation in cows with subclinical mastitis. In cows with subclinical mastitis, S. epidermidis IMI were mainly found in multiparous cows, whereas S. chromogenes IMI were mainly found in primiparous cows.

Key Words: dairy cow • subclinical mastitis • coagulase-negative staphylococci • epidemiology