Resistance to "O" test

The anti-streptolysin "O" test, referred to as "anti-O" for short, is an antibody produced by the body with streptolysin O as an antigen. By determining the ASO antibody titer in the serum, it is possible to determine whether a patient has a group A hemolytic streptococcal infection, which can be used as one of the auxiliary diagnostic methods for group A hemolytic streptococcal infection. However, this test has no specific significance, because group A streptococcal infection can cause a variety of human diseases, such as corresponding tonsillitis, scarlet fever, acute nephritis, subacute bacterial endocarditis, and nephrotic syndrome caused by streptococcal infection. Etc. can cause elevated ASO. After human infection with hemolytic streptococcus, various antibodies can appear in the serum, such as anti-streptokinase antibodies, anti-hyaluronic acid antibodies, and anti- & quot; O & rdquo; hemolysin antibodies. Whether a serological diagnostic test of activity is more meaningful. 60% to 80% of patients with rheumatism are active. ASO is elevated, and multiple tests are normal to help rule out rheumatism.