Etiology Hepatitis A virus (HAv) One serotype, one antigen-antibody system HAAS g Anti-HAV: anti-HAV IgM--marker for acute hav infection (3-6 m) anti-HAV IgG -indicator of immunity to HAV 0 Strong resistance alive very long at low temperature 10 Inactivated by heating to 80oC5' min or 100oC 1' min ultraviolet light formalin solutionHepatitis A virus (HAV)  One serotype, one antigen-antibody system HAAg Anti-HAV: anti-HAV IgM --- marker for acute HAV infection(3-6 m) anti-HAV IgG --- indicator of immunity to HAV Strong resistance, alive very long at low temperature Inactivated by heating to 80oC 5’ min or 100oC 1’ min ultraviolet light formalin solution Etiology Etiology