Cysteine ​​test

Brucella is a pathogenic bacteria of cattle, sheep, pigs and other animals. Humans are very susceptible to brucella, and clinical manifestations are intermittent fever, so it is also called wave fever. After the illness, lectins, precipitins, opsonins, complement-binding antibodies, and blood antibodies appear in body fluids. Therefore, serological methods are often used for diagnosis. Brucella that harms humans and livestock are: Brucella malta (sheep), Brucella abortus (bovine) and Brucella suis, all of which contain different proportions of M (Malta) and A (Abortion) Two bacterial antigens. Usually only one Brucella can be used to detect antibodies to any of the three Brucella. In addition, Brucella still has a surface antigen that can cross-agglutinate with the serum of patients with Tular fever (hare fever), cholera, and Yersinia coli, so the value of the agglutination reaction is not as reliable as that of the fat test. Complement binding test has high specificity, but this kind of antibody (mainly IgG) appears late and lasts a long time, which is of great significance in the diagnosis of chronic brucellosis.