<prompt> Which of the following does not have non-human reservoirSalmonella typhiYersinia pestisEscherichia coliClostridium tetani  <response>: 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 