Progression of Salmonella enteritidis phage type 4 strains in São Paulo State, Brazil.
A total of 574 S. Enteritidis strains (383 from human sources and 191 from non-human sources) isolated between 1975-95, in São Paulo State, Brazil, were phagetyped. Among the strains isolated during the period of 1975-92, 80.9% of them belonged to phage type 8 (PT-8), but in 1993 strains of PT-4 accounted for 65.2% of all the S. Enteritidis isolates. In the following years, PT-4 strains accounted for 99.7% and 98.4% of phagetyped S. Enteritidis strains. The results obtained suggested that the current epidemic of S. Enteritidis in São Paulo State is clearly associated with the progression of PT-4 strains.
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Instituto Adolfo Lutz, Seção de Bacteriologia, São Paulo, Brazil.
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Tavechio
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D017122:Bacteriophage T4; D001434:Bacteriophage Typing; D001938:Brazil; D006801:Humans; D012477:Salmonella enteritidis / Q000145:classification* / Q000302:isolation & purification