epidemic focus的用法和樣例：
例句
- This study has investigated the region for the epidemic area of tsutsugamushi disease.
本研究對該地區恙蟲病疫源地進行全面研究。 - Methods The investigation of the epidemic area,the isolation of Orientia tsutsugamushi,the study of pervention measures were carried out.
方法疫源地流行病學調查，病原分離鑒定與分子生物學研究，預防措施的制定。
