The predominant Escherichia coli faecal flora of healthy individuals was studied over a period of several weeks. E. coli in the intestine showed a spectrum of persistence. The concept of ‘resident’and ‘transient’strains is discussed and a clarification of nomenclature is suggested.

Presumptive coliform counts and the distribution of Escherichia coli O‐serotypes were investigated in chicken rectal contents (175) abdominal cavities (152) and on the carcasses of 44 which had been commercially raised, slaughtered and prepared for sale. Large numbers of E. coli resistant to at least one antibacterial agent were found at each site; comparison of the O‐serotypes suggested heavy contamination of the carcass with strains from the gut. The range of O‐serotypes was similar to that found in man and some public health implications of cross‐infection particularly by handling uncooked birds in the kitchen, are discussed.

No abstract

Attempts to limit the use of antibiotics have not, in general, resulted in the gut flora in farm animals becoming predominantly sensitive. Partial success has been demonstrated, however, by feeding chickens with antibiotic sensitive Escherichia coli known to be good colonizers of the chicken gut. Where feeding was done prior to slaughter a corresponding reduction in carcass contamination by resistant E. coli was observed.