<prompt> Which of the following is true of cholera-Recent epidemic was due to classical typeCauses secretory diarrhoeaCaused by endotoxinVibriocidal antibodies correspond to susceptibility  <response>: Vibrio causes secretory diarrhea.About Other options:Recent epidemics are due to O1 ElTor and also O139 serovar. Classical still exists and few cases were reported from BangladeshVibriocidal antibodies in serum titer 1:20 have been associated with protection against colonization and disease. ... Jawetz 25e p237Endotoxin LPS does not play any role in pathogenicity of cholera but is responsible for immunity developed by killed vaccine. 