coronavirus strains that seem to spread more easily are causing alarm, but virus experts say it’s unclear if that’s the case or whether they pose any concern for vaccines or cause more severe disease.Viruses naturally evolve as they move through the population, some more than others.
It’s one reason we need a fresh flu shot each year. Canada to suspend all flights from U.K. for 72 hours as new coronavirus variant spreads New variants, or strains, of the virus that causes COVID-19 have been seen almost since it was first detected in China nearly a year ago.On Saturday, Prime Minister Boris Johnson announced new restrictions because of the new strain.