<prompt> True about cholera -Gram negative rodAssociated with feverCauses painful watery diarrheaAll  <response>: Ans. is a i.e., Gram negative rod Vibrio cholerae is a gram negative rod bacillus. It causes painless watery diarrhea, without associated fever. Vibrios are highly susceptible to acids and gastric acidity provides an effective barrier against small dose of V. cholerae. Therefore, achlorhydria predisposes for infection by V cholerae. 