<prompt> All of the following are true about V. cholerae O139 except:Clinical manifestations are similar to O1 E1 torFirst discovered in ChennaiProduces O139 lipopolysaccharideEpidemiologically indistinguishable from O1 E1 tor  <response>: 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. 