BSIP, JOUBERT / SCIENCE PHOTO LIBRARY BSIP, JOUBERT / SCIENCE PHOTO LIBRARY
Hepatitis B virus. Computer illustration of a hepatitis B virus, a cause of liver inflammation. Its lipoprotein envelope (brown) surrounds its protein coat (capsid, pink). The capsid contains the virus' DNA (deoxyribonucleic acid, green). Hepatitis B is transmitted by contact with infected blood, for example through sexual intercourse or by a blood transfusion. Symptoms include headache, fever, weakness and jaundice.
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