Southwest China's Yunnan Province has confirmed 15 COVID-19 cases and 45 asymptomatic infections since March 30 in the city of Ruili, on the border with Myanmar.

The residents are now under home quarantine for at least one week, and the whole city has collected 309,448 nucleic acid samples within 24 hours

The city also announced an immunization campaign starting on Friday, with the plan to vaccinate everyone within five days.