Infective dose of salmonella typhi ?: (A) 10 bacilli, (B) 1000 bacilli, (C) 103-106 bacilli, (D) 1010 - 1012 bacilli
Answer is C. Ans. is 'c' i.e., 103-106 bacilli In human volunteer experiments, the infective dose was found to be 103-106 bacilli.