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Salmonella in the American cockroach: evaluation of vector potential through dosed feeding experiments

Published online by Cambridge University Press:  15 May 2009

Marc J. Klowden  and
Bernard Greenberg
Marc J. Klowden
Affiliation:
Department of Biological Sciences, University of Illinois at Chicago Circle, Chicago, Illinois 60680
Bernard Greenberg
Affiliation:
Department of Biological Sciences, University of Illinois at Chicago Circle, Chicago, Illinois 60680
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Restrained American cockroaches, Periplaneta americana L., were fed graded doses of Salmonella typhimurium ranging from 1·6 × 103 to 2·0 × 106, and their faeces assayed daily for the pathogen. Only 4 specimens out of 117 demonstrated multiplication of salmonellas, which was unrelated to size of input. When data of persistence regardless of actual numbers were expressed as percentage Salmonella-positive faecal-days, and these transformed to probits, a graph of percentage-positive faecal-days versus log dose allowed a calculation of the CD 50, or contaminative dose required for 50% of the faecal-days to be infective. The CD 50 for this cockroach species was 1·4 × 106Salmonella.

Type
Research Article
Information
Journal of Hygiene , Volume 77 , Issue 1 , August 1976 , pp. 105 - 111
Copyright
Copyright © Cambridge University Press 1976

References

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