Hepatitis A is a liver infection caused by the Hepatitis A virus, a non-enveloped RNA virus. Unlike Hepatitis B and C, it does not cause chronic liver disease, but it can trigger acute liver failure in severe cases. The WHO's May 2026 fact sheet reports that an estimated 35,569 people died from Hepatitis A globally in 2023, representing 2.6 percent of all viral hepatitis deaths.
The virus spreads through the fecal-oral route: a person ingests microscopic amounts of fecal matter from an infected person, almost always through contaminated food or water. The infectious dose is extremely small. There are no sensory signals. Contaminated food looks, smells, and tastes completely normal.
Symptoms and the Deceptive Timeline
Symptoms typically appear 14 to 50 days after exposure, with most cases surfacing two to four weeks after contact. That delay is part of what makes food-borne Hepatitis A difficult to trace. By the time a patient develops symptoms, the contaminated product may have been consumed weeks earlier and long since discarded, forgotten, or sold out.
Symptoms include fever, general malaise, loss of appetite, nausea, abdominal discomfort, dark-coloured urine, pale or clay-coloured stools, and jaundice, the yellowing of eyes and skin that makes many patients seek care. Children under six often show no symptoms at all, but can still transmit the virus to others.
There is no specific antiviral treatment. Recovery is supportive: rest, fluids, nutrition. Mild cases typically resolve in one to two weeks; severe cases can last several months.