Serological test Test the antibodies in patients using the known antigens a antigen structure of bacter ia(o, h, Vi) toxin(o streptolys in) Specific anti gen a ant ibody early igM, later IgGSerological test Test the antibodies in patients using the known antigens q n n q antigen：structure of bacteria（O,H,Vi） toxin（O streptolysin） Specific antigen antibody：early IgM，later IgG