شناسایی گونه جدیدی از ویروس کرونا در بریتیش کلمبیا

FILE - In this April 13, 2021, file photo, school employee Amanda Anguiano gets tested for COVID-19 on the first day of in-person learning at Maurice Sendak Elementary School in Los Angeles. Children are having their noses swabbed or saliva sampled at school to test for the coronavirus in cities. As more children return to school buildings this spring, widely varying approaches have emerged on how and whether to test students and staff members for the virus. (AP Photo/Jae C. Hong, File)