Shanghai added 21,058 new cases on Saturday, bringing total infections in the city of 25 million to 490,000 since a wave of the highly contagious Omicron variant hit the financial capital on March 1.

Of those who died, only five were vaccinated against Covid, said Zhao Dandan, a deputy director of Shanghai’s health commission. The city would add more medical resources to treat severe cases, she said, urging eligible elderly people to get vaccinated as soon as possible.

There have been outbreaks at many of Shanghai’s 800 nursing homes since Omicron hit the city in early March. In one facility, the Donghai Elderly Care Hospital, at least 40 patients died by April 6 after the virus spread through the hospital, a Wall Street Journal investigation showed.

Only 62% of Shanghai residents aged 60 and over are vaccinated. The rate drops to 15% for the 800,000 residents who are over 80, the latest official data show. Meanwhile, most, if not all, the vaccination sites are closed as the lockdown continues in many parts of the city.