A migrant worker from Xiantao, central China's Hubei Province, receives body temperature check upon arrival at Zhongshan City, south China's Guangdong Province, March 17, 2020. A batch of migrant workers with qualified health QR code returned Zhongshan City of Guangdong Province from Xiantao of Hubei Province by chartered buses. (Xinhua)

Migrant workers from Xiantao, central China's Hubei Province, talk with staff receiving them in Zhongshan City, south China's Guangdong Province, March 17, 2020. A batch of migrant workers with qualified health QR code returned Zhongshan City of Guangdong Province from Xiantao of Hubei Province by chartered buses. (Xinhua)

Migrant workers from Xiantao, central China's Hubei Province, receive gifts upon arrival at Zhongshan City, south China's Guangdong Province, March 17, 2020. A batch of migrant workers with qualified health QR code returned Zhongshan City of Guangdong Province from Xiantao of Hubei Province by chartered buses. (Xinhua)

A migrant worker from Xiantao, central China's Hubei Province, registers personal information after her arrival at Zhongshan City, south China's Guangdong Province, March 17, 2020. A batch of migrant workers with qualified health QR code returned Zhongshan City of Guangdong Province from Xiantao of Hubei Province by chartered buses. (Xinhua)