Table 1. Frequency of switching of smooth phenotype of V. cholerae strains to rugose phenotype.

Strains	Source	Year of isolation	Strains examined (n)	Conversion of smooth to rugose phenotype (%)
V. cholerae O1	Clinical	2010–13	70	30 (42.9)
V. cholerae O1	Environmental	2012–13	24	12 (50.0)
V. cholerae non-O1/non-O139	Environmental	2012–13	78	38 (48.7)
Total		2010–13	172	80 (46.5)

The strains were isolated from clinical and environmental sources in Haiti between 2010 and 2013.