<prompt> Which of the following has least minimum infective doseMID required for causing infection:Salmonella typhiCampylobacter jejuniShigella dysenteryVibrio cholera  <response>: Ans. c Shigella dysentery Shigella cause bacillary dysentery. Infection occur by ingestion. The minimum infective dose is low: as few as I0-IN bacilli are capable of initiating the disease, probably because they survive gastric acidity better than other enterobacter- Ananthanarayan. 