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Carriage of Bacteria by Proboscises, Legs, and Feces of Two Species of Flies in Street Food Vending Sites in Ouagadougou, Burkina Faso

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Abstract:

Flies are widely recognized as potential reservoirs and vectors of bacteria. In the present study, an attempt was made to assess meat-poultry and local fruit juice processing and vending sites for their hygienic status and the presence of houseflies, Musca domestica, and blow flies, Lucilia caesar, for bacterial carriage. The hygienic status results revealed the presence of waste and sewage nearby which provided food and harborage for flies. On the two sites, the M. domestica population was dominant ranging from 76.48 to 91.30%, while the L. caesar population rate ranged from 8.70 to 23.52%. Using specific growth media for bacteria and biochemical tests, bacterial carriage of pooled fly proboscises, legs, and feces were assessed. For both flies, 66.67 to 100% of feces pools were positive for Shigella, Salmonella, and streptococci, while 35.41 to 82.05% of leg and proboscis pools were positive for the same bacteria. In assessment, 0 to 2.56% of feces pools and 8.33 to 28.20% of leg and proboscis pools were staphylococci positive. Coliforms were detected in 100% of pooled organs, while 10 × 103 to 1.1 × 103 CFU with predominance of coliforms, streptococci, and Shigella were counted on legs and feces of houseflies captured on the two vending sites. Blow flies from the same vending site had an organ bacterial load in the range of 3 × 102 to 2.7 × 103 CFU per organ. Coliforms, Shigella, and streptococci were present in high numbers. Staphylococci was noticed in low numbers in all parts tested of both flies. Captured housefly and blow fly bacteria-releasing frequency through feces was estimated at 5 to 35 CFU per feces sample for Salmonella and 85 to 495 CFU per feces sample for Shigella.

Document Type: Research Article

Affiliations: 1: Laboratoire de Biochimie et de Génétique moléculaire microbienne, Centre de Recherche en Sciences Biologiques, Alimentaires et Nutritionnelles (CRSBAN) UFR-SVT, Université de Ouagadougou, Burkina Faso 2: Laboratoire de Technologie Alimentaire, Centre de Recherche en Sciences Biologiques, Alimentaires et Nutritionnelles (CRSBAN) UFR-SVT, Université de Ouagadougou, Burkina Faso 3: Département de Biochimie Microbiologie, Centre de Recherche en Sciences Biologiques, Alimentaires et Nutritionnelles (CRSBAN) UFR-SVT, Université de Ouagadougou, Burkina Faso

Publication date: August 1, 2006

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    First published in 1937, the Journal of Food Protection®, is a refereed monthly publication. Each issue contains scientific research and authoritative review articles reporting on a variety of topics in food science pertaining to food safety and quality. The Journal is internationally recognized as the leading publication in the field of food microbiology with a readership exceeding 11,000 scientists from 70 countries. The Journal of Food Protection® is indexed in Index Medicus, Current Contents, BIOSIS, PubMed, Medline, and many others.

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