The term viral hepatitis refers to primary infection of the liver by any one of a heterogeneous group of hepatitis viruses which is currently consist of types A,B,C,D,E and G. Type A hepatitis (infectious hepatitis)is a sub acute disease of global distribution, affecting mainly children and young adults. The large majority of infectious are asymptomatic. Over illness is seen in only about 5percent of those infected. Natural infection with HAV, clinical or subclinical leads to lifelong immunity. There is no cross immunity between HAV and any of other hepatitis viruses. Treatment is asymptomatic .no specific antiviral drug is available.

Keywords: Hepatitis; Treatment; Vaccination; Infection; Immunity; Viremia.