title: Prolonged in vitro exposure of Staphylococcus aureus to germicidal teat dips.
abstract: Eight strains of Staphylococcus aureus were tested to determine if prolonged exposure to commercial teat dips could enhance bacterial tolerance to teat dips in vitro. All strains of S. aureus were serially plated 15 times on chemically defined agar medium containing sublethal concentrations of linear dodecyl benzene sulfonic acid, chlorhexidine, sodium hypochlorite, and iodophor teat dips. Growth responses of S. aureus to chlorhexidine, sodium hypochlorite, and iodophor were not affected by prolonged exposure to these teat dips. Isolates subcultured on agar containing .1% linear dodecyl benzene sulfonic acid teat dip subsequently had a greater mean growth response to .1% solution of the germicide than did controls subcultured on basal medium. Hemolytic patterns, tube coagulase, clumping factor, and protein A reactions of S. aureus were not altered by exposure to any of the teat dips tested. In general, prolonged exposure to commercial teat dips did not alter germicidal susceptibility of S. aureus.
authors.affiliation: Department of Dairy Science, The Ohio State University, Ohio Agricultural Research and Development Center, Wooster 44691.
authors.forename: J S
authors.initials: JS
authors.lastname: Hogan
authors.forename: K L
authors.initials: KL
authors.lastname: Smith
mesh_terms: D000818:Animals; D000891:Anti-Infective Agents, Local / Q000494:pharmacology*; D001557:Benzenesulfonates / Q000494:pharmacology; D002417:Cattle; D002710:Chlorhexidine / Q000494:pharmacology; D005260:Female; D007466:Iodophors / Q000494:pharmacology; D008321:Mammary Glands, Animal / Q000382:microbiology*; D008826:Microbial Sensitivity Tests; D012973:Sodium Hypochlorite / Q000494:pharmacology; D013211:Staphylococcus aureus / Q000187:drug effects* / Q000254:growth & development; D013997:Time Factors
chemical_list: D000891:Anti-Infective Agents, Local; D001557:Benzenesulfonates; D007466:Iodophors; C001114:dodecylbenzenesulfonic acid; D012973:Sodium Hypochlorite; D002710:Chlorhexidine