1. “Shanghai starts China’s biggest COVID-19 lockdown in 2 years ” Associated Press (2022).
2. Shanghai Municipal Health Commission “Shanghai COVID-19 cases update” (2022); https://wsjkw.sh.gov.cn/yqtb/index.html [in Chinese].
3. “Severe symptoms caused by Omicron how to save the patients? ” CCTV (2022); https://tv.cctv.cn/2022/05/13/VIDEpNpQ943Uq9zoDq3Rul1Q220513.shtml [in Chinese].
4. “Shanghai completed 13 polymerase chain reaction (PCR) tests from March 10th to April 16th testing more than 200 million people total ” CCTV (2022); https://cn.chinadaily.com.cn/a/202204/17/WS625c02baa3101c3ee7ad0db6.html [in Chinese].
5. L. Jialin “COVID-19 polymerase chain reaction PCR test false positive events ” The Economic Observer (2022); www.eeo.com.cn/2022/0514/534378.shtml [in Chinese].