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1986年7月间,应用利什曼素对471名山丘型黑热病流行区延长县的健康人群进行皮内试验调查。结果各年龄组人群均有阳性反应出现,但以16岁以上人群多见,总阳性率为3.2％,此与1974年在该区宜川县的调查结果8.0％(28/348)比较,差异有极显著性(P<0.01)。提示该区虽仍有传染源存在,但15岁以下人群免疫水平已显著降低。调查结果表明.黑热病在当地的流行已呈下降趋势,防治是有成效的。
In July 1986, Leishmanin was used to conduct an intradermal test in 471 healthy people in Yanchang County, a endemic area of endemic hill-type fever. Results There were positive reactions in all age groups, but the common positive rate was 3.2% in those over 16 years old, which was different from the 8.0% (28/348) of the survey results in Yichuan County in 1974. Significantly (P <0.01). Although there is still a source of infection in this area, the immunization level of people below 15 years of age has been significantly reduced. The survey results show that the prevalence of kala-azar in the local area has shown a downward trend, and prevention and treatment has been effective.