Gram Negative Bacilli
A 50-year-old man recently visited India and developed diarrhea before returning to the United States. Vibrio cholerae O1 (El Tor, Ogawa) was isolated from his stool. Which of the following is the biotype of the V. cholerae strain? (AIPG 2011)
a. The O antigen of Vibrio species has been given numbers to indicate serotype, a form of subdivision for strains of cholera organism.
b. V. cholerae serogroups O1 and O139 have long been recognized as strains responsible for epidemic and pandemic cholera.
c. V. cholerae serogroups O1 is further divided into biotypes ElTor and classical.
d. There have been six pandemics from 1817-1923, most likely caused by the O1 serotype, classical biotype.
e. A new pandemic (seventh) caused by the El Tor biotype started in Asia in 1961.