title: Enzootic occurrence of chloramphenicol-resistant Salmonella typhimurium var copenhagen in calf population.
abstract: Chloramphenicol (CP)-resistant Salmonella typhimurium var copenhagen was frequently isolated (44.1 to 76.7%) from dead, diseased, and healthy calves on 3 farms in 1973 in northern Japan. On 2 of the farms, CP-resistant salmonella appeared suddenly during an epizootic of salmonella infection, and persisted. Of 87 CP-resistant to tetracycline (TC), streptomycin (SM), and sulfonamides (SA), and the remaining 13 isolates from dead calves on a farm were resistant to TC, SM, SA, and kanamycin (KM). Resistance patterns of all CP-resistant isolates were transferred completely.
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000382:microbiology*; D002701:Chloramphenicol / Q000494:pharmacology*; D003470:Culture Media; D004352:Drug Resistance, Microbial; D004926:Escherichia coli / Q000187:drug effects; D005243:Feces / Q000382:microbiology; D007564:Japan; D007612:Kanamycin / Q000494:pharmacology; D008099:Liver / Q000382:microbiology; D008198:Lymph Nodes / Q000382:microbiology; D011815:R Factors; D012481:Salmonella Infections, Animal / Q000382:microbiology*; D012486:Salmonella typhimurium / Q000187:drug effects* / Q000302:isolation & purification; D013307:Streptomycin / Q000494:pharmacology; D013449:Sulfonamides / Q000494:pharmacology; D013752:Tetracycline / Q000494:pharmacology
chemical_list: D003470:Culture Media; D013449:Sulfonamides; D007612:Kanamycin; D002701:Chloramphenicol; D013752:Tetracycline; D013307:Streptomycin