الفهرس 
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Abstract
It is a member of picoma virus family (/Jlelnick, 1982).
The Vlms is a small, non envolred virus approximetaly 27 nm in diamater (Day and Lemon 1992).
The VIruS transmitted fium person to person by FeeD-oral route (Fros/ler, 1991).
Transmission by blood seems to be rare only few cases of post transfusion HAV has been reported (Dbu/a Zans, 1992)
.• Geographic distribution:
In developing countries of AtTica, Asia, and South America, where all individual become anti HA V postive individual dming childhood and remam postive during adulthood and decline in older age group (Frosller,
1991) .
.• High risk groups:
Homosexual men show an increase prevalence of anti- HA V (Cory and Holms, 1980). Another high risk group toHA V includes travelers and tourists coming from an endemic area.