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Antimicrobial resistance in streptococcal species isolated from bovine mammary glands.
1990
Brown M.B. | Scasserra A.E.
Streptococcal species isolated from dairy cows with clinical mastitis were obtained from mastitis research workers in Florida, Louisiana, New York, Vermont, Washington, and West Virginia. Seventy-one streptococcal isolates were tested, including 39 strains of Streptococcus agalactiae, 21 strains of S dysgalactiae, and 11 strains of S uberis. The minimal inhibitory concentration of erythromycin, lincomycin, oxytetracycline, penicillin, spectinomycin, streptomycin, and tetracycline was determined for each isolate. Differences were not detected among strains with respect to geographic origin. None of the strains was resistant to penicillin. Lincomycin was the next most effective antimicrobial, with only 2 resistant strains of each streptococcal species. There were no differences among the streptococcal species with respect to resistance to either penicillin or lincomycin. Streptococcus uberis was more likely to be resistant to erythromycin than were S agalactiae and S dysgalactiae (P < 0.02). Streptococcus agalactiae and S uberis had similar distributions for resistance to oxytetracycline, tetracycline, spectinomycin, and streptomycin. Strains of S dysgalactiae were more likely to have intermediate resistance to oxytetracycline and streptomycin than were strains of S agalactiae and S uberis, which were highly resistant to oxytetracycline and streptomycin (P < 0.001). Differences were not detected among the streptococcal species with respect to resistance to spectinomycin. Resistance to multiple antimicrobials was observed in all streptococcal species tested. Although S dysgalactiae appeared to have a greater percentage of strains (73%) that were resistant to multiple antimicrobials than did S agalactiae (31%) or S uberis (45%), differences were not statistically significant.
显示更多 [+] 显示较少 [-]Spontaneous lingual papillomas in fischer 344 rats.
1992
Kang B.H. | Lim C.H.
An occurrence of canine herpesvirus infection in Korea
1992
Kim, O.J. | Bak, U.B. (Seoul Nat'l Univ., Suwon (Korea Republic). Coll. of Veterinary Medicine) | An, S.H. | Kim, D.H. | Shin, J.H. (Rural Development Administration, Anyang (Korea Republic). Veterinary Research Inst.)
Spontaneous nephroblastoma in a New Zealand White rabbit: A case report
1992
Kang, B.H. | Ha, C.S. (Korea Research Inst. of Chemical Technology, Taejon (Korea Republic). Toxicology Research Center)
Studies on the ploidy distributions of the hepatocytes isolated in hepatocarcinogensis of rats
1992
Choi, K.C. | Lee, Y.S. (Seoul Nat'l Univ., Suwon (Korea Republic). Coll. of Veterinary Medicine)
Demarcation of potentially mineral-deficient areas in central and northern Namibia by means of natural classification systems
1996
Grant, C.C. | Biggs, H.C. (Directorate of Veterinary Services, Windhoek (Namibia)) | Meissner, H.H.
The distribution, diagnoses and estimated economic impact of plant poisonings and mycotoxicoses in South Africa
1996
Kellerman, T.S. | Naude, T.W. | Fourie, N. (Agricultural Research Council, Onderstepoort (South Africa). Onderstepoort Veterinary Inst.)
A pathology of spontaneous tumors in SPF Ktc:ICR mice
1992
Son, H.Y. | Jun, M.H. | Cho, S.W. (Chungnam Nat'l Univ., Taejon (Korea Republic). Coll. of Veterinary Medicine) | Kang, B.H. | Han, S.S. (Korea Research Inst. of Chemical Technology, Taejon(Korea Republic). Toxicology Research Center)
