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A medical worker injects COVID-19 vaccine for a senior citizen in Fengxian District of Shanghai, April 21, 2022. Senior citizens are encouraged to get COVID-19 vaccines in Shanghai. (Photo: China News Service/Yin Liqin)
![](http://www.ecns.cn/hd/2022/04/22/927d7124c0b14111a7ac1d4d6966246d.jpg)
A medical work takes temperature for a senior citizen in Fengxian District of Shanghai, April 21, 2022. Senior citizens are encouraged to get COVID-19 vaccines in Shanghai. (Photo: China News Service/Yin Liqin)
![](http://www.ecns.cn/hd/2022/04/22/efe8456537544be498c1ceca6a1e906c.jpg)
A medical worker prepares a dose of COVID-19 vaccine in Fengxian District of Shanghai, April 21, 2022. Senior citizens are encouraged to get COVID-19 vaccines in Shanghai. (Photo: China News Service/Yin Liqin)
![](http://www.ecns.cn/hd/2022/04/22/5b8561bd51a5421bb0c3dddaa6cf6162.jpg)
A medical worker helps fill out registration form for seniors in Fengxian District of Shanghai, April 21, 2022. Senior citizens are encouraged to get COVID-19 vaccines in Shanghai. (Photo: China News Service/Yin Liqin)
![](http://www.ecns.cn/hd/2022/04/22/dc9da5f55d5449929d34be72dfb9f2bd.jpg)
A medical worker helps fill out registration form for seniors in Fengxian District of Shanghai, April 21, 2022. Senior citizens are encouraged to get COVID-19 vaccines in Shanghai. (Photo: China News Service/Yin Liqin)