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-positive bacterial isolates cultured from synovial samples from adult horses indicated that most had susceptibility to β-lactam antimicrobials (18/23 [78%] susceptible to penicillin and 19/21 [90%] susceptible to ceftiofur; Table 5 ). Further, results for 23 of 25

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in Journal of the American Veterinary Medical Association

, including flunixin meglumine, potassium penicillin, and gentamicin. Methods Animals This study was approved by the North Carolina State Institutional Animal Care and Use Committee (IACUC 23-110). Four liters of whole blood from 8 healthy adult

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in American Journal of Veterinary Research
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.8 Metronidazole 5.2 14.1 14.6 11.5 17.9 13.6 21.7 27.6 26.3 20.6 +294 0.003 +51 0.357 12.2 Penicillins 53.1 37.2 28.0 29.8 22.7 23.0 19.8 17.4 15.3 11.9 −78 0.002 −48 0.001 7.1 Potentiated

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in Journal of the American Veterinary Medical Association

schleiferi isolates also carry the mecA gene and express PBP2a. 17,19 Staphylococcal isolates that have mecA-mediated oxacillin resistance are considered to have in vivo resistance to all β-lactam drugs, including potentiated penicillins, cephalosporins

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in Journal of the American Veterinary Medical Association

at −80°C until use. It was thawed and extended (1:3 mixture of semen and commercially available semen extender containing amikacin sulfate and penicillin G potassium a ). The final concentrations of amikacin and penicillin G potassium in the extender

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in Journal of the American Veterinary Medical Association

lesions followed by penicillin administration, closedsystem lavage and intralesional administration of tulathromycin, and closed-system lavage and parenteral administration of tulathromycin. Materials and Methods Sample population —Client-owned sheep

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in Journal of the American Veterinary Medical Association

CLSI-approved breakpoints for BRD caused by these pathogens were included in this study. The antimicrobials evaluated for P multocida were florfenicol, ceftiofur, enrofloxacin, tulathromycin, spectinomycin, and penicillin. The antimicrobials evaluated

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in American Journal of Veterinary Research

sum and Kruskal-Wallis tests. To evaluate potential associations between AMD use in horses and antimicrobial resistance in isolates, AMDs used to treat HOSP–AMD horses were categorized by class (aminoglycoside, penicillin, potentiated sulfonamide

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in Journal of the American Veterinary Medical Association

dilution ranges were as follows: penicillin, 0.12 to 8 μg/mL; ampicillin, 0.25 to 16 μg/mL; ceftiofur, 0.5 to 8 μg/mL; gentamicin, 1 to 8 μg/mL; apramycin and neomycin, 4 to 32 μg/mL; spectinomycin, 8 to 64 μg/mL; chlortetracycline, 0.5 to 8 μg

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in American Journal of Veterinary Research

additive antimicrobials c (apramycin, bacitracin, carbadox, erythromycin, florfenicol, hygromycin, lincomycin, neomycin, penicillin G, roxarsone, sulfamethazine, sulfathiazole, tetracycline, tiamulin, tylosin, and virginiamycin); antimicrobial-free saline

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in American Journal of Veterinary Research