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Hepatitis A is a liver infection caused by the Hepatitis A virus (HAV). Hepatitis A is highly contagious. It is usually transmitted by the fecal-oral route, either through person-to-person contact or consumption of contaminated food or water. Hepatitis A is a self-limited disease that does not result in chronic infection. More than 80% of adults with Hepatitis A have symptoms but the majority of children do not have symptoms or have an unrecognized infection. Antibodies produced in response to Hepatitis A last for life and protect against reinfection. The best way to prevent Hepatitis A is by getting vaccinated.