乙型肝炎病毒(HBV)一般是感染肝细胞并在此增殖,同时通过肝细胞进入血液和胆道系统。另一方面,乙型肝炎表面抗原(HBsAg)又不是仅在血液中才能检出,其他体液也可检出,包括唾液、尿液、耳咽分泌物、精液、胰液。最近已证实,HBV 的DNA 不仅是在肝细胞,在Kaposi 氏肉瘤和淋巴样母细胞中都可存在。一些学者应用组织学的方法研究表明:除了肝脏外HBV 抗原在其他组织也有发现。虽然也有许多学者 Hepatitis B virus (HBV) generally infects and proliferates hepatocytes, while entering the blood and biliary system through the liver cells. On the other hand, hepatitis B surface antigen (HBsAg) is not detectable only in the bloodstream. Other bodily fluids are also detectable, including saliva, urine, esophageal secretions, semen and pancreatic juice. It has recently been demonstrated that HBV DNA is not only present in hepatocytes but also in Kaposi’s sarcoma and lymphoid cells. Some scholars using histological methods studies have shown that: in addition to the liver HBV antigens found in other tissues. Although there are many scholars