Fishborne zoonotic intestinal trematodes, Vietnam - PubMed (original) (raw)

Fishborne zoonotic intestinal trematodes, Vietnam

Do Trung Dung et al. Emerg Infect Dis. 2007 Dec.

Abstract

Although fishborne zoonotic trematodes that infect the liver are well documented in Vietnam, intestinal fishborne zoonotic trematodes are unreported. Recent discoveries of the metacercarial stage of these flukes in wild and farmed fish prompted an assessment of their risk to a community that eats raw fish. A fecal survey of 615 persons showed a trematode egg prevalence of 64.9%. Infected persons were treated to expel liver and intestinal parasites for specific identification. The liver trematode Clonorchis sinensis was recovered from 51.5%, but > or =1 of 4 intestinal species of the family Heterophyidae was recovered from 100%. The most numerous were Haplorchis spp. (90.4% of all worms recovered). These results demonstrate that fishborne intestinal parasites are an unrecognized food safety risk in a country whose people have a strong tradition of eating raw fish.

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Figures

Figure 1

Figure 1

Typical dish of raw fish (slices of silver carp) sold in Vietnamese restaurants.

Figure 2

Figure 2

Map of Vietnam showing location of Nam Dinh Province, investigated for fishborne zoonotic trematode infections, April 2005.

Figure 3

Figure 3

Adult trematodes isolated from Vietnamese persons. A) Haplorchis pumilio. B) H. taichui. C) H. yokogawai. D) Stellantchasmus falcatus. (Semichon acetocarmine stained, magnification ×120.)

Figure 4

Figure 4

Multiple fishborne trematode infections in humans, Nam Dinh Province, Vietnam, April 2005.

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