The Cockroaches Blaberus Craniifer and Blaberus Discoidalis as Vectors of Salmonella Typhosa

Publisher Website
Google Scholar
Abstract
Salmonella typhosa was not excreted by Blaberus species mounted and fed under controlled conditions even when fed in massive doses, while Salmonella enteriditis was excreted up to 17 days. In vivo determinations of pH were conducted with a microquinhydrone electrode, and the pH of the crop of the roaches was found to range from 3.9 to 4.9. In vitro testing confirmed the findings that pH levels of 4.5 or lower are destructive to typhoid cells while the S. enteriditis organisms are relatively resistant. The antibacterial effect in vivo appears to be due to the acid produced in the crop of roaches through the action of microorganisms. No bacteriophage activity was demonstrated.