近年来,对乙型肝炎的流行病学做了大量的研究工作。除肯定了经血传播这一途径外,并相继在唾液、汗液、喷嚏物、精液、乳汁、胸腹水、羊水、尿、脐带血等多种体液中检出了目前认为系完整乙型肝炎病毒的戴恩氏(Dane)颗粒和乙型肝炎表面抗原(HBsAg)。从而证实乙型肝炎是以密切接触为主要传播途径,其中唾液内HBsAg阳性与乙型肝炎在口腔科的传染关系较密切。 In recent years, a great deal of research work has been done on the epidemiology of hepatitis B. In addition to affirming the route of blood transmission, it has been detected in saliva, sweat, sneeze, semen, milk, pleural effusion, amniotic fluid, urine, cord blood and other body fluids that are currently considered to be complete hepatitis B virus Dane particles and Hepatitis B surface antigen (HBsAg). Thus confirmed that hepatitis B is closely contacted as the main route of transmission, of which saliva HBsAg positive and hepatitis B infection in the stomatology closer.