To contain the recent COVID-19 case surge, Shijiazhuang, capital of north China's Hebei Province, starts a second round of its citywide nucleic acid tests, January 12, 2021. /VCG

A total of 688 buses have been temporarily converted into mobile sample collection facilities, to raise the efficiency and provide a warmer working site in winter for the health workers. /VCG

The buses are also used to transport health workers and medical supplies when needed. /VCG

Inspiring banners are seen put on the buses, which read: "Victory to Shijiazhuang!"