epidemic focus的用法和样例：
例句
- This study has investigated the region for the epidemic area of tsutsugamushi disease.
本研究对该地区恙虫病疫源地进行全面研究。 - Methods The investigation of the epidemic area,the isolation of Orientia tsutsugamushi,the study of pervention measures were carried out.
方法疫源地流行病学调查，病原分离鉴定与分子生物学研究，预防措施的制定。
