A Survey on Salmonella Contamination of Chicken Meat and Its Prevention

V. Types and Drug Resistance of Isolated Straine

Abstract

Typing was made on Salmonella strains detected from broilers produced in Saitama Prefecture and from chicken-processing plants over a period of 1968 to 1971. In 1970, Salmonella typhimurium, S. thompson, and S. infantis were detected at the decreasing order of frequency listed. In 1971, S. sofia was detected most frequently and followed by S. typhimurium and S. thompson in the decreasing order listed
Resistance to streptomycin (SM) and tetracycline (TC) was observed in 62.1% and 22.3%, respectively. Strains resistant to SM alone were the most numerous and followed by those resistant to SM and TC. Those resistant to TC alone appeared infrequently. There was a rapid increase in rate of detection of strains resistant to SM and TC with the lapse of time. Strains resistant to SM, TC, and kanamycin were detected for the first time in 1971.