A medical worker prepares a COVID-19 vaccine shot in Heping District of Shenyang, northeast China's Liaoning Province, Jan. 13, 2021. Shenyang has completed COVID-19 inoculation for 82,727 people as of Jan. 12. (Xinhua/Cai Xiangxin)

A medical worker inoculates a recipient with a COVID-19 vaccine in Heping District of Shenyang, northeast China's Liaoning Province, Jan. 13, 2021. Shenyang has completed COVID-19 inoculation for 82,727 people as of Jan. 12. (Xinhua/Cai Xiangxin)

A medical worker inoculates a recipient with a COVID-19 vaccine in Heping District of Shenyang, northeast China's Liaoning Province, Jan. 13, 2021. Shenyang has completed COVID-19 inoculation for 82,727 people as of Jan. 12. (Xinhua/Cai Xiangxin)

A medical worker inoculates a recipient with a COVID-19 vaccine in Heping District of Shenyang, northeast China's Liaoning Province, Jan. 13, 2021. Shenyang has completed COVID-19 inoculation for 82,727 people as of Jan. 12. (Xinhua/Yang Qing)

A medical worker inoculates a recipient with a COVID-19 vaccine in Heping District of Shenyang, northeast China's Liaoning Province, Jan. 13, 2021. Shenyang has completed COVID-19 inoculation for 82,727 people as of Jan. 12. (Xinhua/Yang Qing)

A medical worker registers a recipient before COVID-19 vaccine inoculation in Heping District of Shenyang, northeast China's Liaoning Province, Jan. 13, 2021. Shenyang has completed COVID-19 inoculation for 82,727 people as of Jan. 12. (Xinhua/Cai Xiangxin)

Medical workers register recipients before COVID-19 vaccine inoculation in Heping District of Shenyang, northeast China's Liaoning Province, Jan. 13, 2021. Shenyang has completed COVID-19 inoculation for 82,727 people as of Jan. 12. (Xinhua/Yang Qing)

A medical worker inoculates a recipient with a COVID-19 vaccine in Heping District of Shenyang, northeast China's Liaoning Province, Jan. 13, 2021. Shenyang has completed COVID-19 inoculation for 82,727 people as of Jan. 12. (Xinhua/Yang Qing)