Hepatitis A testing for anti-HAV immunoglobulin G (anti-HAV IgG) reveals IgG antibodies that manifest later in the course of the illness. IgG antibodies provide protection against reinfection with the hepatitis A virus and are detectable in the body for the rest of a person's life. Hepatitis A virus (HAV), a picornavirus, mostly transmits via the fecal-oral pathway. Throughout five to ten days of the onset of symptoms, IgM antibody is typically detectable. It typically peaks within the first month of illness, goes undetectable after six months of infection, and peaks again within the first month of sickness.