A. Dalsgaard et al., PREVALENCE AND CHARACTERIZATION OF VIBRIO-CHOLERAE ISOLATED FROM SHRIMP PRODUCTS IMPORTED INTO DENMARK, Journal of food protection, 59(7), 1996, pp. 694-697
A total of 3,555 metric tonnes of warm water shrimp were imported into
Denmark from December 1994 to July 1995. V. cholerae O1 was not detec
ted in any of the 748 samples analyzed. Non-Ol V. cholerae was found i
n a single (0.1%) cooked frozen shrimp product and in five (0.7%) raw
frozen products, all originating from shrimp produced in aquaculture.
Six isolated strains agglutinated in polyvalent O antisera, but did no
t agglutinate in Ogawa or Inaba antisera. The six strains were resista
nt to colistin and sulfisoxazole; three strains also showed resistance
to ampicillin. None of the strains contained plasmids or genes encodi
ng cholera toxin (CT) or heat-stable enterotoxin (NAG-ST), The absence
of V. cholerae O1 and the low number of samples containing CT and NAG
-ST negative non-Ol strains in imported shrimp suggest that I! cholera
e in such products may not constitute a public health problem.