China’s Tianjin testing all residents after omicron found

Tianjin, a major Chinese port city near the capital Beijing, began mass testing of its 14 million residents on Sunday after a cluster of 20 children and adults tested positive for COVID-19, including at least two with the omicron variant. Those infected include 15 students from 8 to 13 years old, a staff member at an after-school center and four parents. The citywide testing is to be completed