Antibiotic-Resistant E. coli More Likely Among Poultry Workers

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A recent study conducted by the Johns Hopkins Bloomberg School of Public Health says that poultry workers in the United States are 32 times more likely to carry E. coli bacteria resistant to the commonly used antibiotic, gentamicin, than others outside the poultry industry.

The press release states that E.coli and other drug resistant bacteria are common in the industrial broiler chicken environment; this is the first U.S. research to show exposure occurring at a high level among industrial poultry workers.

“The use of antimicrobials in industrial food production has been going on for over 50 years in the United States,” said the study’s lead author, Lance B. Price, who serves on the research faculty at the Johns Hopkins School of Medicine, Division of Infectious Disease, and is a scientific advisor to the Johns Hopkins Center for a Livable Future. “Some estimates indicate that well over half of the antimicrobial drugs produced in the United States are used in food animal production. In the U.S. alone, over nine billion food animals are produced annually.”

The researchers worked with poultry workers and community residents in the eastern shore regions of Maryland and Virginia. The study confirms similar studies in Europe that show that poultry farmers and workers are at risk of exposure to drug-resistant E. coli bacteria.

The Maryland and Virginia regions on the Delmarva Peninsula are among the top broiler chicken producing regions in the U.S., producing more than 600 million chickens annually.

The researchers carried out in-depth analyses of 49 study participants, 16 working within the poultry industry and 33 community residents. Stool samples were obtained from the participants and were tested for resistance to the antimicrobials ampicillin, ciprofloxacin, ceftriazone, gentamicin and tetracycline.

The findings showed that poultry workers had 32 times greater odds of being colonized with gentamicin-resistant E. coli than other members of the community.

“One of the major implications of this study is to underscore the importance of the non-hospital environment in the origin of drug resistant infections,” said Ellen K. Silbergeld PhD, senior author of the study.

The researchers noted that as food animal production shifted from the independent farmer to large-scale, industrialized operations, the use of antimicrobials in feeds intended to stimulate growth has increased.

There are currently 16 different antimicrobial drugs approved for use in U.S. poultry production with gentamicin reported to be the most widely used.

Additional study authors of Elevated Risk of Carrying Gentamicin-Resistant Escherichia coli among U.S. Poultry Workers are Jay P. Graham, Lelia G. Lackey, Amira Roess and Rocio Vailes, all at the Johns Hopkins Bloomberg School of Public Health.