Antimicrobial Resistant Enteropathogenic Escherichia coli and Salmonella spp. in Houseflies Infesting Fish in Food Markets in Zambia

Mwansa M. Songe, Bernard M. Hang’ombe, Theodore J. D. Knight-Jones and Delia Grace
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Mwansa M. Songe: Food Safety and Zoonoses Program, Zambia, International Livestock Research Institute (ILRI), Lusaka 10101, Zambia
Bernard M. Hang’ombe: Paraclinical Studies Department, School of Veterinary Medicine, University of Zambia, Lusaka 10101, Zambia
Theodore J. D. Knight-Jones: Food Safety and Zoonoses Program, Zambia, International Livestock Research Institute (ILRI), Lusaka 10101, Zambia
Delia Grace: Food Safety and Zoonoses Program, Kenya, International Livestock Research Institute (ILRI), Nairobi 00100, Kenya

IJERPH, 2016, vol. 14, issue 1, 1-10

Abstract: Diarrhea is one of the most common diseases and is a leading cause of death in developing countries. This is often caused by contaminated food. Poor food hygiene standards are exacerbated by the presence of flies which can transmit a variety of infectious microorganisms, particularly through animal source foods. This fact becomes especially important in developing countries like Zambia, where fish is a highly valued source of protein. Our interest in this study was to identify if the flies that beset food markets in Zambia carry important pathogenic bacteria on their bodies, and subsequently if these bacteria carry resistance genes to commonly used antibiotics, which would indicate problems in eradicating these pathogens. The present study took into account fish vendors’ and consumers’ perception of flies and interest in interventions to reduce their numbers. We conducted semi-structured interviews with (1) traders (comprised of randomly selected males and females) and (2) consumers (including randomly selected males and females). Thereafter, we collected flies found on fish in markets in Mongu and Lusaka districts of Zambia. For the entire study, a total of 418 fly samples were analyzed in the laboratory and Salmonella spp. and enteropathogenic Escherichia coli were isolated from the flies. Further laboratory screening revealed that overall, 17.2% (72/418) (95% CI; 43.2%–65.5%) of total samples analyzed contained Extended-Spectrum Beta-Lactamase (ESBL)-producing E. coli . These significant findings call for a strengthening of the antibiotic administering policy in Zambia and the development of sustainable interventions to reduce fly numbers in food markets and improve food safety and hygiene.

Keywords: fish; informal food markets; houseflies; Escherichia coli; Salmonella; antimicrobial resistance (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2016
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