1986年4月我们对115例出血热病毒感染者进行了血清流行病学调查,结果:在1980～1982年间患病的30例中仍可检出流行性出血热抗体阳性者27例、阴性3例。27例阳性者中,20例由原有较高滴度(1:1280～80)逐渐下降到1:320～20,5例由较低滴度(1:20～80)逐渐上升到1:80～320,2例维持于原有滴度(1:20、1:320)。在1980～1986年临床确诊的83例EHF患者中检出阳性者72例(87%),抗体水平呈逐年 In April 1986, we conducted a serological epidemiological survey of 115 cases of haemorrhagic fever virus infection. Results: In the 30 cases of illness between 1980 and 1982, 27 cases were still positive for antibodies to epidemic hemorrhagic fever, negative 3 example. Among the 27 positive cases, 20 cases gradually decreased to 1: 320-20 from the original higher titer (1: 1280-80) and gradually increased from 1: 20-80 to 1: 80 ~ 320,2 cases maintained at the original titer (1:20, 1: 320). In 83 cases of EHF patients clinically diagnosed from 1980 to 1986, 72 cases (87%) were positive, and the antibody level showed a year by year