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B in a proportion of patients. 
In 95% of neonates and 3–5% of adults, acute HBV infection does not clear spontaneously and chronic infection can persist for years.
10–30% of chronically infected patients develop chronic hepatitis, which may lead to more serious conditions including cirrhosis, liver failure and hepatocellular carcinoma.
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Acute hepatitis B is usually self limiting and benign, but may progress to chronic hepatitis B in a proportion of patients. 
In 95% of neonates and 3–5% of adults, acute HBV infection does not clear spontaneously and chronic infection can persist for years.
10–30% of chronically infected patients develop chronic hepatitis, which may lead to more serious conditions including cirrhosis, liver failure and hepatocellular carcinoma.