Hepatitis a virus a positive-stranded rna genome approximately 7.5 kb long At least 4 different hav genotypes(l, ll, Ill, and Vil) Only one antigen-antibody system °Ant-HA∨ Igm is diagnostic evidence of recent infection Igg is protective antibodyHepatitis A Virus • A positive-stranded RNA genome approximately 7.5 kb long • At least 4 different HAV genotypes ( I, II, III, and VII) • Only one antigen-antibody system. • Anti-HAV IgM is diagnostic evidence of recent infection • IgG is protective antibody 5