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

Publisher Website
Google Scholar
Abstract
SUMMARY: Restrained American cockroaches,Periplaneta americanaL., were fed graded doses ofSalmonella typhimuriumranging from 1·6 × 103to 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 percentageSalmonella-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.