<prompt> Infective dose of salmonella typhi -10 bacilli1000 bacilli103 - 106 bacilli1010 - 1012 bacilli  <response>: Ans. is c i.e., 103-106 bacilli Ref: Ananthanarayan 9thep. 295 8the p. 293o In human volunteer experiments, the infective dose was found to be I0M06 bacilli.Organism Infective doseo ETEC-106-1010oEIEC-108-1010o EHEC-10-100 103o Shigella-10-100o Campylobactor jejuni-104o Yersinia enterocolitica-1010-109o Vibrio-1010 if source of infection is water -10-104 if source of infection is food 