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Map of the four hydrographic basins from which Vibrio cholerae O1 was isolated. HB1: Capibaribe hydrographic basin, HB2: Goiana hydrographic basin, HB3: Ipojuca hydrographic basin, HB4: Mundaú hydrographic basin, PE: Pernambuco state, PB: Paraíba state; AL: Alagoas state.
