Abstract
Both the human and the bovine international sets of phages were used for typing of 372 bovine Staphylococcus aureus (Sa) strains, whereas the bovine set alone was used for typing of a further 1183 strains. In addition, 338 of the strains were tested for antibiotic sensitivity. Out of 372 Sa strains 85.5% could be typed with the human and 89.8% with the bovine phage set. Of all the 1555 Sa strains used 92.4% were lysed by the bovine phage set. Several phage types can be present in one and the same herd and some of them can predominate. Resistance to most of the tested antibiotics was very low. The incidence of resistance to penicillin and ampicillin was 10.0% and 4.4% respectively.
Keywords: staphylococcus aureus, mastitis, phage typing, antibioticsensitivity
Sammanfattning
Både det humana och bovina internationella fagseten har använts för att typa 372 bovina Staphylococcus aureus (Sa) stammar medan endast det bovina setet använts vid typning av ytterligare 1183 stammar. Därutöver har 338 av stammarna prövats avseende antibiotikakänslighet.
Av 372 Sa stammar kunde 85,5% typas med det humana och 89,8% med det bovina fagsetet. Av de humana fagerna som inte fanns i det bovina setet lyserade fag 47 och 83A ett relativt stort antal stammar (22,3% respektive 24,7%). I Sverige skulle man kunna fagtypa flera bovina stammar om det bovina fagsetet kompletterades med dessa fager.
Av samtliga 1555 Sa stammar kunde 92,4% typas med det bovina fagsetet. I en och samma besättning förekom ett flertal fagtyper av vilka några dominerade.
Resistenten för det flesta testade antibiotika var mycket liten. Mot penicillin och ampicillin var 10,0% respektive 4,4% av stammarna resistenta.
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