During 1992, 1993 and 1994 a total of 65, 123 and 142 faecal samples respectively yielded 9, 54 and 87 strains of V. cholerae. Simultaneous occurrence of EL TOR vibrio and non 01 (i.e. 0139) was noted during 1993 and 1994 with variations in relative and absolute prevalence of each serotype. Seasonal incidence is fairly consistent in this region. Both V. cholerae serotypes 01 and 0139 showed resistance to one or more drugs.