Restriction fragment length polymorphism analysis of Vibrio cholerae strains associated with a cholera outbreak in Hong Kong.

We studied Vibrio cholerae El Tor isolates associated with an outbreak of cholera among Vietnamese refugees interned in Hong Kong. The restriction fragment length polymorphism of the enterotoxin gene was used as an epidemiological marker. All outbreak strains were indistinguishable. They were distinct from strains isolated in Hong Kong prior to the outbreak.