The peak of China’s COVID-19 wave is expected to last two to three months, and will soon swell over the vast countryside where medical resources are relatively scarce, a top Chinese epidemiologist has said.

Infections are expected to surge in rural areas as hundreds of millions travel to their home towns for the Lunar New Year holidays, which officially start from Jan. 21, known before the pandemic as the world’s largest annual migration of people.

China last month abruptly abandoned the strict anti-virus regime of mass lockdowns that fuelled historic protests across the country in late November, and finally reopened its borders this past Sunday.