A senior citizen takes a COVID-19 vaccine shot in a community health service center in Putuo District, Shanghai, yesterday. The city began to vaccinate residents aged 76 and above in its voluntary and free COVID-19 vaccination program. More than 400 million doses of COVID-19 vaccines had been administered in China by Sunday as the country steps up the inoculation drive, according to the National Health Commission yesterday.   (Story on P4)                                                                                                               China News Service