- An RNA virus is transmitted via enteric routes in epidemics and sporadic cases, similar to HAV.
- Modes of transmission include waterborne, zoonotic/foodborne and, less commonly, through blood transfusion and perinatally.
- Eight genotypes described, with four causing human illness and distinct transmission means suspected.
- Genotypes 1, 2: predominantly fecal-contaminated water in developing countries worldwide.
- Genotypes 3, 4: Zoonotic transmission appears more foodborne (insufficiently cooked game meat or pork products and shellfish in North America, Western Europe, and Japan).
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