Course

The course of the illness varies widely. In around a third of cases, there are no signs of sickness, another third have only mild symptoms, which are often mistaken for the flu. The final third develop more severe symptoms, usually two to three months after becoming infected.

Symptoms may include fatigue, loss of appetite, muscle and joint pain, upper abdominal pain, nausea, vomiting and fever. A few days later, jaundice appears: the eyes and skin become yellow, urine becomes darker and stools become lighter.

In adults, the body is usually able to defeat the infection and symptoms disappear after several weeks. Sometimes, however, the illness becomes chronic and it must then be treated. Occasionally the illness is very severe and can even lead to liver failure.

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