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The diphyllobothriasis incidence in the workers of the Amur basin steamship company during 1980-1989 was studied. This rate was shown to be more than 6 times than that of other population (68.7 and 10.4 case per 100,000 person, respectively). The role of the workers of the company in the circulation of the invasion and prophylactic measures in the region were discussed.
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The author describes a case of imported diphylobothriosis in a Czechoslovak citizen who returned after a 6-month stay from Finland. The tapeworm Diphylobothrium latum is bound in its life cycle to aqueous crustaceans and fish. Man is infected by ingestion of inadequately thermally processed fish. The author draws attention to the possible import of this uncommon parasitosis.
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Praziquantel (Droncit) is a new anthelminthic agent with a strikingly wide therapeutic index. The efficiency of the drug against Diphyllobothrium latum was tested in vivo and in vitro. With a drug dose of 50 mg/kg, artificially infected hamsters were completely cured. The threshold value of the active dose was between 2-5 and 10-0 mg/kg. Clinical trials with Praziquantel against human diphyllobothriasis show great promise, all of ten patients treated with 25-0 mg/kg of the drug being cured. Praziquantel had little effect on larval or adult diphyllobothriids in vitro.
A review is presented of food-borne parasitic infections. Parasitic infections with public health hazards both from conventional slaughter animals and from seafood (fish and shellfish) are discussed. The former category includes cysticercosis, echinococcosis, and trichinosis, the latter category covers various trematode, cestode, nematode, and possibly also protozoan infections. Examples of trematode infections are heterophyidiasis, transmitted to man by marine fish, and Paragonimus spp parasites, transmitted by crustaceans. Cestode infections include diphyllobothriasis transmitted by both fresh water fish and fish from brackish waters. Special attention is drawn to the condition known as sparganosis. Of the nematode infections, the eosinophilic granulomatous enteritis due to the genera Anisakis, Phocanema, and Contracaecum, transmitted to man by either marine fish or crustaceans, is mentioned. Two other nematode infections. Angiostrongylus cantonensis and Capillaria philippinensis, can also be transmitted to man by marine fish. Free living amoebae (a.o. Naegleria) may be transmitted to man via shellfish as vehicles. Apart from a possible direct effect of these parasites, chemical alterations in seafood resulting from the presence of parasites may also be deleterious to the consumer. Special attention is drawn to a newly developed serological detection method, the enzyme-linked immunosorbent assay, which makes detection of infection possible not only at the slaughterhouse but also at the farm or in large herds. Strategies to control parasitic infections both in conventional slaughter animals and in seafood are discussed.
A type of Diphyllobothrium plerocercoid found in blue whiting, Micromestius poutasson, caught near the north edge of the Faeroe Banks, is described. The most dominant characters of these larvae are their typical dorsoventrally flattened body and their fully extruded and "adult"-like scolex. A morphological comparison with perocercoids of D. dendriticum, D. ditremum and D. latum is given.