Although most V. mimicus strains have not retained the ctx genes (the primary virulence factor responsible for the severe diarrhea seen in cholera), the 2 strains isolated in this outbreak carried a wide variety of potential virulence determinants, showing varying degrees of similarity with potential virulence factors reported for other V. mimicus strains (1,7). This evidence concerns the gene CYP27A1 and vibrio infectious disease.