KAUSIK KAUSIK,
"The prototype seventh pandemic El Tor biotype of Vibrio cholerae O1 is completely replaced from 1995 by El Tor strains that have classical type ctxB in Kolkata, India.". , vol:
15, No.1
Jan. 2009, pp: 131-132, https://scholar9.com/publication-detail/the-prototype-seventh-pandemic-el-tor-biotype-of-v-5489
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