All of the following are true about V. cholerae O139 except:

Ans. is 'b' i.e., First discovered in ChennaiO139 Vibrio was isolated first in Chennai because it was not agglutinated by any of the antisera available at that time (O1-O138) and identified as Bengal strain (O139) in Bengal in 1992 and Clinical manifestation and epidemiological features are similar to O1.O139 is identical to EI Tor except - Produces O139 Lipopolysaccharide (LPS) and Pathogenicity of O139 is due to O Ag (polysaccharide capsule).Abs to V. cholerae is not protective against O139.