| shiga toxin-producing escherichia coli o157 in beef and chicken burgers, and chicken carcasses in buenos aires, argentina. | we describe the isolation and characterization of shiga toxin (stx)-producing escherichia coli (stec) o157:h7 from cooked and uncooked beef and chicken burgers and from chicken carcasses collected during sampling procedures in 2001 and 2002 in buenos aires city, argentina. of the 24 stec o157:h7 strains isolated, 20 were recovered from 19 (6.8%) out of 279 samples of beef and chicken burgers, and 4 strains from 4 (10.3%) out of 39 chicken carcasses. the samples were analyzed following the usda/f ... | 2009 | 19443067 |