Canada’s top doctor says federal officials are mobilizing their genome sequencing networks in an effort to catch a potentially more infectious strain of the virus that causes COVID-19. Chief public health officer Dr. Theresa Tam says the strain has not yet been detected in Canada. One particular lineage of the SARS-CoV-2 virus is appearing to dominate infections in the U.K., with an epidemiologist there suggesting mutations on the new strand could be making it 70 percent more infectious. Experts say more data is needed before they can verify that, however, and they expect current vaccines to still work on the new strand. Viruses are constantly changing and mutating, says Tam, and Canada has been undergoing sequencing on COVID viral samples for months in an effort to track those kinds of alterations. News of the revamped strand in the U.K., which has already been found in other parts of the world, …