<prompt> All except one are true for hepatitis B -Veical transmission more impoant than horizontalAge of onset determines prognosisPeriod of communiciability lasts several monthsVims can be found in blood I month before jaundice  <response>: The hepatitis B virus is spread when blood, semen, or other body fluid infected with the hepatitis B virus enters the body of a person who is not infected. People can become infected with the virus from: Exposure to blood from needlesticks or other sharp instruments of an infected person. but most of the exposure occurs through direct contact . Exposure to needles ,and body fluids Ref Davidson edition23rd pg 877 