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Am. J. Trop. Med. Hyg., 8(4), 1959, pp. 405-411
Copyright © 1959 by The American Society of Tropical Medicine and Hygiene

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Persistence of Bacteria in the Developmental Stages of the Housefly

I. Survival of Enteric Pathogens in the Normal and Aseptically Reared Host*

Bernard Greenberg
University of Illinois, College of Pharmacy, Chicago, Illinois

1. Salmonella typhi and Shigella flexneri, introduced into CSMA, a normally contaminated larval medium, were recovered infrequently from larvae and not at all from adult houseflies.
2. Under the same conditions, Salmonella paratyphi B was recovered more frequently from larvae and adults, though from a smaller percentage of adults than larvae.
3. S. typhi, when introduced into a sterilised larval medium, probably underwent some multiplication, whether or not maggots were present.
4. Each of the above species, including Salmonella enteritidis, when introduced into a sterilised larval medium, was routinely recovered from larvae and pupae of various ages. Mature maggots typically harbored about 107 organisms. The counts of pupae from the second day until emergence were stabilized at 103 to 104. A small number of pupae were sterile or retained relatively few bacteria.
5. An explanation based on interspecific competition in the larval medium is suggested for the differential survival of these pathogens in fly stages breeding under natural conditions.


* This study was supported by a grant from the University of Illinois Research Board.

The author gratefully acknowledges the helpful interest of Dr. Howard J. Shaughnessy, Professor of Public Health, University of Illinois, College of Medicine, and the contribution of Miss Esther Cooksey of Chicago in the preparation of the charts.






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Copyright © 1959 by the American Society of Tropical Medicine and Hygiene.