Etiology Hepatitis A--- HAV 0 27-32nm non-enveloped spherical particle 075Kb single-stranded positive rNa virus 10 Picornaviridae family hepadnavirusHepatitis A --- HAV 27-32nm, non-enveloped spherical particle 7.5Kb single-stranded, positive RNA virus Picornaviridae family heparnavirus Etiology Etiology