Hepatitis B: Approximately 2 billion people are infected with the hepatitis B virus (HBV), making it the most common infectious disease in the world today. Over 350 million of those infected never rid themselves of the infection. Hepatitis is an inflammation of the liver that causes symptoms such as jaundice, extreme fatigue, nausea, vomiting, and stomach pain; hepatitis B is the most serious form of the disease. Chronic infections can cause cirrhosis of the liver or liver cancer in later years.
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