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