Which of the following does not have non-human reservoir: (A) Salmonella typhi, (B) Yersinia pestis, (C) Escherichia coli, (D) Clostridium tetani
Answer is A. Man is the only natural host for S.typhi and S.paratyphi A whereas most of the other salmonella are chiefly pathogenic in an animal. Clostridium, E.coli and yersinia infect both human and animal. Ref: Textbook of Microbiology, Ananthanarayan and Paniker; 9th edition