Sampling time: 06:00- 12:00 on May 22nd.

Sampling scope: all residents of seven towns, including Langya Town, Wang Xi Town, Xiandu Town, Dingyuan Town, Baocheng Town, Xinshi Town and Youqing Town.

2. The second batch:

Sampling time: 08: 00-18: 00 on May 23rd;

Sampling scope: all teachers, students and employees in the county education system.

3. The third batch:

Sampling time: 07: 00-12: 00 on May 24th;

Sampling scope: Wenchong Town, Yongxing Town, Guifu Town, Yanfeng Town, Jingbian Town, Qingxichang Town, Linba Town, tuxi Town, Sanhui Town, fengle town Town, Sanban Town, Wanshou Town, Longfeng Town, Zhongtan Town, Qinglong Town, Qubei Town, Lifu Town, dong an town Town, Lidu Town, Dongjuan Town, Heli Town and Anbei Town.

4. The fourth batch:

Sampling time: May 24th16: 00-21:00;

Sampling scope: all residents of Qu South Street, Qujiang Street and Tianxing Street and Qu County Economic Development Zone.