A citizen enters a supermarket after scans a health tracking QR code in Ruili, southwest China's Yunnan Province, April 1, 2021. Southwest China's Yunnan Province has launched a large-scale inoculation drive in a border area where a cluster of COVID-19 cases was reported recently. The move that started Thursday aims to vaccinate all eligible residents in four border counties and cities under Dehong Dai and Jingpo Autonomous Prefecture, said the prefecture's disease control and prevention center. (Xinhua/Chen Xinbo)