Hepatitis A is a viral infection that affects the liver, caused by the hepatitis A virus (HAV). Here are important aspects of hepatitis A:

1. Transmission: Hepatitis A is typically transmitted through ingestion of contaminated food or water, or through close contact with an infected person. It is most commonly associated with poor sanitation and hygiene practices.
2. Symptoms: Symptoms of hepatitis A can range from mild to severe and may include fever, fatigue, loss of appetite, nausea, abdominal discomfort, dark urine, and jaundice (yellowing of the skin and eyes). Children often have mild or no symptoms, whereas adults tend to experience more severe symptoms.
3. Course of Illness: The illness usually resolves on its own over several weeks to months, and most people recover completely with no lasting liver damage. However, in rare cases, hepatitis A can cause acute liver failure, which can be life-threatening.