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. 2006 Oct 18;115(2):195–200. doi: 10.1289/ehp.9391

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Spread of Vibrio cholerae O139 in India from east to west (adapted from Nair et al. 1994). An arrow shows the dissemination of cholera from east (Visakhapatnam) to west (Pune) during March–April 1993; this spread of cholera continued from May to July 1993. A second arrow indicates the spread of the epidemic upstream along the Ganga River Valley in May–July 1993.