Hepatitis B Surface Antigen

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Hepatitis B is caused by the Hepatitis B Virus (HBV). Highest concentrations of this virus are in the blood, but it can also localize in semen, vaginal secretions and open wounds. Risk factors include:

Blood-to-blood contact
Contaminated needles
Unprotected sex
History of other STDs
Birth mother with HBV

Hepatitis B symptoms appear six weeks to six months after exposure. The immune system can clear this virus or it can become chronic. Children younger than five are more likely than adults to become chronically infected. A chronic infection increases the possibility of the patient later developing cirrhosis or cancer.

Hepatitis Symptoms and Treatment