a viral hepatitis caused by the hepatitis B virus (HBV), an acute or chronic hepatitis that is caused by a DNA virus (species Hepatitis B virus of the genus Orthohepadnavirus, family Hepadnaviridae), is marked chiefly by fatigue, fever, nausea, vomiting, abdominal pain, darkened urine, jaundice, and joint pain but may be asymptomatic, and is transmitted especially by contact with infected blood (as by transfusion or by sharing contaminated needles in illicit intravenous drug use) or by contact with other infected bodily fluids (such as semen), B‑hepatiidi viiruse tekitatud maksapõletik, mh. vereülekandel, sugulisel teel ja sünnitusel (emalt lapsele) nakkav maksapõletik