Prevention of Hepatitis a through Active Cdc Form

Instructions and help about Prevention Of Hepatitis A Through Active Cdc

(electronic music) Hepatitis A, a liver disease caused by infection with the hepatitis A virus, referred to as HAV, is diagnosed by the use of appropriate serologic tests. The diagnosis of acute hepatitis A is confirmed during the acute or early convalescent phase of HAV infection by the presence of IgM antibodies to HAV, referred to as IgM anti-HAV. This serologic marker is shown by the pink hatched line and is usually present from five to ten days before the onset of clinical symptoms, noted by the purple bar. The median onset of symptoms is 28 days after infection, noted by the vertical dotted line, but can range from 15 to 50 days. IgM anti-HAV usually declines to undetectable levels within six months after infection. IgG antibodies to HAV, referred to as IgG anti-HAV, shown in the black hatched line, begin to rise at or right before the onset of clinical illness, and persist to provide lifelong immunity. IgG anti-HAV is also produced following immunization with hepatitis A vaccine