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Muthukumarappa, Thungapathra; Ghosh, Amit; Sharma, Charu; Gupta, Naveen; Mukhopadhyay, Asish; Kole, Hemanta; Nair, Gopinath Balakrish; Ghosh, Ranajit Kumar (2000) rocess for the isolation of a nontoxinogenic vibrio cholerae strain and a process for preparing cholera vaccine from said vibrio cholerae strain. US6106843.