英语语法分析

Chemoprophylaxis of close contacts and vaccination of high-risk population groups is ongoing.

密切接触者的化学预防和高危人群组的预防接种正在进行。

Contact tracing of all clinical suspect cases is being done and 305 households have been administered chemoprophylaxis.

正在对所有临床疑似病例开展接触者追踪，并且已有305户家庭实施化学预防。

Control measures are underway including contact tracing, chemoprophylaxis of household contacts, and immunization of high risk groups.

正在采取控制措施，包括接触者追踪、家庭接触者化学预防和高危群体免疫接种。