Serological test method: serum titer o Ab in restoration stage Vs ab in acute stage ≥4 a typhoid fever paratyphi id fever 0≥80,H≥160 口 Rheumatic fever0≥500Serological test n q q q method：serum titer Ab in restoration stage Vs Ab in acute stage： ≥4 Typhoid fever 、 paratyphoid fever O≥80,H≥160, Rheumatic fever O≥500