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Duplicate fecal specimens from food handlers were collected in Louisiana. One set of specimens was examined immediately for salmonellae and shigellae by the Central Laboratory of the Louisiana State Board of Health in New Orleans; the other set was shipped to the Food Microbiology Unit at the Robert A. Taft Sanitary Engineering Center in Cincinnati, Ohio, where it was examined for enteropathogenicEscherichia coli (EEC) andClostridium perfringens . A total of 219 specimens were examined by both laboratories. None yielded salmonellae or shigellae; 171 (78.1%) yieldedC. perfringens ; 175 (79.9%) yieldedE. coli ; and 14 (6.4%) yielded EEC. The 14 isolates of EEC were distributed among eight serotypes; one specimen yielded two serotypes. Multiple isolations ofC. perfringens strains (two to four) were made from 64 (37.4%) of the specimens, and a total of 244 strains were isolated and studied for identifying characteristics. Of the total, only 87 (35.5%) could be identified serologically by a battery of 67 antisera; only 4 (1.6%) possessed the characteristics of the English “food-poisoning type.” The hemolytic activity on agar containing horse, ox, or sheep blood showed that 140 (57.1%) were “hemolytic,” 81 (33.1%) were “nonhemolytic,” and 23 (9.8%) gave varied results. Only 12 (4.9%) of the strains produced spores that resisted boiling for 30 min or more.

Examination of Feces from Food Handlers for Salmonellae, Shigellae, Enteropathogenic Escherichia coli , and Clostridium perfringens