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Covid cases will surge in rural China where healthcare is less accessible, a top Chinese epidemiologist has warned.
Hundreds of millions of Chinese are travelling to their hometowns - many for the first time since the pandemic began - ahead of the lunar new year.
The peak of China's Covid wave is expected to last two to three months, added Zeng Guang, ex-head of the Chinese Center for Disease Control.
China has stopped providing daily Covid statistics since abandoning zero-Covid.
However hospitals in big cities - where healthcare facilities are better and more easily accessible - have become crowded with Covid patients as the virus has spread through the country.
Speaking at an event earlier this month, Mr Zeng said it was "time to focus on the rural areas", in remarks reported in the Caixin news outlet.
Many elderly, sick and disabled in the countryside were already being left behind in terms of Covid treatment, he added.
China's central Henan province is the only province to have given details of infection rates - earlier this month a health official there said nearly 90% of the population had had Covid, with similar rates seen in urban and rural areas.
However government officials say many provinces and cities have passed the peak of infections.
The Lunar New Year holidays in China, which officially start from 21 January, involves the world's largest annual migration of people.
Some two billion trips are expected to be made in total and tens of millions of people have already travelled.
Last month, China abruptly abandoned its zero Covid policies. It also reopened its borders on Sunday.
The World Health Organisation (WHO) said China, which stopped reporting Covid fatalities from Tuesday, was heavily under-reporting Covid deaths.
Official data shows five or fewer deaths a day over the past month, numbers which are inconsistent with the long queues seen at funeral homes and reports of deaths on social media.
In December Chinese officials said they planned to issue monthly rather than daily updates on the Covid situation in the country.
International health experts have predicted at least a million Covid-related deaths in China this year. Beijing has officially reported just over 5,000 deaths since the pandemic began, one of the lowest death rates in the world.