Builders work at the construction site of a temporary quarantine center in Yuzhou City, central China's Henan Province, Jan. 15, 2022. About 5,000 isolation board houses are expected to be constructed in Yuzhou for individuals under medical quarantine amid the latest COVID-19 resurgence. (Photo: Xinhua)

Builders work at the construction site of a temporary quarantine center in Yuzhou City, central China's Henan Province, Jan. 14, 2022. About 5,000 isolation board houses are expected to be constructed in Yuzhou for individuals under medical quarantine amid the latest COVID-19 resurgence. (Photo: Xinhua)

A builder works at the construction site of a temporary quarantine center in Yuzhou City, central China's Henan Province, Jan. 15, 2022. About 5,000 isolation board houses are expected to be constructed in Yuzhou for individuals under medical quarantine amid the latest COVID-19 resurgence. (Photo: Xinhua)

Aerial photo taken on Jan. 15, 2022 shows the construction site of a temporary quarantine center in Yuzhou City, central China's Henan Province. About 5,000 isolation board houses are expected to be constructed in Yuzhou for individuals under medical quarantine amid the latest COVID-19 resurgence. (Photo: Xinhua)

A builder works at the construction site of a temporary quarantine center in Yuzhou City, central China's Henan Province, Jan. 15, 2022. About 5,000 isolation board houses are expected to be constructed in Yuzhou for individuals under medical quarantine amid the latest COVID-19 resurgence. (Photo: Xinhua)

Builders work at the construction site of a temporary quarantine center in Yuzhou City, central China's Henan Province, Jan. 14, 2022. About 5,000 isolation board houses are expected to be constructed in Yuzhou for individuals under medical quarantine amid the latest COVID-19 resurgence. (Photo: Xinhua)

Aerial photo taken on Jan. 14, 2022 shows the construction site of a temporary quarantine center in Yuzhou City, central China's Henan Province. About 5,000 isolation board houses are expected to be constructed in Yuzhou for individuals under medical quarantine amid the latest COVID-19 resurgence. (Photo: Xinhua)

Aerial photo taken on Jan. 14, 2022 shows the construction site of a temporary quarantine center in Yuzhou City, central China's Henan Province. About 5,000 isolation board houses are expected to be constructed in Yuzhou for individuals under medical quarantine amid the latest COVID-19 resurgence. (Photo: Xinhua)