surface antigen

An antigen that surrounds the surface of bacterial antigens
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Surface antigen refers to the surface of bacterial cell antigen antigen , its existence can interfere Bacterial antigen Binding with the corresponding antibody. Pneumococcus Of Capsular antigen , some Gram negative bacilli Surface antigen of E. coli K antigen Typhoid bacillus Of Vi antigen Etc. stay lymphocyte The surface can be Specific antibody (e.g monoclonal antibody )Identified Surface molecule Because the surface antigen is in lymphocytes differentiation It is also called Differentiation antigen Because antigen recognition is Monoclonal antibody The names of monoclonal antibodies in different laboratories are different, so there are multiple names of the same antigen. To avoid confusion, in 1983 Differentiation group (CD) Unified naming Lymphocyte surface antigen There are more than 130 antigens.
Chinese name
surface antigen
Foreign name
surface antigen
Definition
Surround Bacteria Cell antigen appearance
Classification
Medical terminology
Bacteriosome The surrounding polysaccharide component is heat resistant and can block the reaction between 0 antigen and corresponding antibody.
Hepatitis B surface antigen (HBsAg) is outer membrane protein It may appear early after HBV infection. HBsAg positive It is a sign of HBV infection. It can exist in patients' blood, saliva, milk, sweat, tears, nasopharyngeal secretions, semen and Vaginal discharge Medium. Two to six months after infection with hepatitis B virus, when Alanine aminotransferase Positive results can be detected in serum 2 to 8 weeks before the elevation. Acute hepatitis B Most patients can turn negative early in the course of disease, Chronic hepatitis B The index of patients is continuously positive. [1]
We often meet some very healthy people in our daily life HBsAg positive He thought he had hepatitis B and was afraid of infecting people around him. In fact, hepatitis B surface antigen positive alone cannot determine whether it is infectious or not. Whether it is infectious or not mainly depends on the degree of replication of the virus in the liver. If the replication of the virus is very active and a large number of virus particles are released into the blood, the person's blood will be highly infectious.