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Fly Dispersion from a Rural Mexican Slaughterhouse^*

Bernard Greenberg AND Alexis Arroyo Bornstein

We have recently reported on the extensive distribution of salmonellae among the flies of a rural Mexican slaughterhouse. The present study concerns the dispersion of these flies throughout the town and peripheral areas. A total of 543 fluorescein-tagged flies belonging to 6 species were recovered from residential sites, market place, dairy and a neighboring village, up to 3 miles from their origin. Flies spread across town within one day. The ready dispersion of Salmonella-contaminated houseflies, blowflies and other species constitutes a health hazard for the 100,000 inhabitants of the town and outlying communities.

^* This study was supported by PHS research grant E-3498 C2, from the National Institute of Allergy and Infectious Diseases, Public Health Service, and conducted at the Instituto de Salubridad y Enfermedades Tropicales, Mexico, D.F. The interest and cooperation of Dr. Gerardo Varela, Director, in facilitating this study, is gratefully acknowledged.

University of Illinois College of Pharmacy, Chicago 12, Ill.