Examples of BglI ribotypes of V. cholerae O1 strains associated with cholera outbreaks in Guinea-Bissau. Unless stated otherwise, the explanations of the lanes include the strain designation, ribotype, and year of isolation. Lanes: A, 1-kb molecular weight standard; B, 1407, ribotype Ia, 1987; C, C235, type II, 1997; D, 1445, type Ia, 1992; E, 1452, type Ia, 1992; F, 1482, type Ia, 1992; G, F2107, type II, 1994; H, F2196, type II, 1994; I, F2189, type II, 1994; J, 1-kb molecular weight standard.