The hepatitis A virus (HAV) is a highly contagious virus that primarily affects the liver. It is transmitted through the ingestion of contaminated food or water, often due to poor sanitation practices. Symptoms can include fatigue, nausea, abdominal pain, and jaundice, which is a yellowing of the skin and eyes. Vaccination is an effective way to prevent hepatitis A, and good hygiene practices, such as washing hands after using the bathroom and before eating, can reduce the risk of infection. Most people recover fully within a few weeks, but the virus can cause severe illness in some cases.