<prompt> Travellers diarrhea is caused by:EIECEPECETECEHEC  <response>: Ans. c ETECRef: Microbiology by Atianthanarayan and Paniker 8th Ed. 276 277 Hemoltic uremic syndrome HUS is a type 3 hypersensitivity reaction associated with small vessel vasculitis. Organisms causing HUS is E.Coli particularly EHEC and shigella dysentriae. 