1　流行病学调查1 1　方法　对疫区全体居民进行查询 ,对有症状者进行回顾调查。凡符合《伤寒伤治手册》诊断标准之一者视为患者。采恢复期患者静脉血 2 0份 ,健康人血 10份 ,患者肛试纸30份 ,于低温 4小时送实验室作血、大便培养和肥达氏反应。以抗 -ＴＯ≥ 1∶80 ,抗 -ＴＨ≥ 1 Epidemiological survey 1 1 Methods All residents in the epidemic area inquiries, the symptomatic were reviewed. Those who meet the “typhoid fever treatment manual” one of the diagnostic criteria as a patient. Blood samples were collected from 20 patients with convalescent venous blood, 10 healthy human blood samples, and 30 samples from the patient’s anus. Blood samples were taken from the laboratory for 4 hours at low temperature, stool culture and Widal’s reaction. To anti-TO ≥ 1:80, anti-TH ≥