目的：评价河北省某恙虫病自然疫源地预防措施效果。

Objective: to evaluate effects of preventive measures to tsutsugamushi disease in an epidemic focus, Hebei province.

youdao

目的：评价河北省某恙虫病自然疫源地预防措施效果。

Objective: to evaluate effects of preventive measures to tsutsugamushi disease in an epidemic focus, Hebei province.

youdao