SUMMARY: Thirty-nine out of 72 drug-resistant strains of isolated from cultured fish and soft-shelled turtles () in various districts of Japan carried transferable drug resistance factors. The fish included eel (), carp (), ayu () and goldfish (). The most common type of resistance factors had the markers of resistance to sulphanilamide and tetracycline and all belonged to the type. Transferable drug resistance was not found in any of 12 strains of isolated from wild eels. The high incidence of resistance factors in from cultured fish is assumed to be due to the selective pressure exerted by chemotherapeutics used in fish culturing.


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