Reports from Britain and South Africa of new 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.
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.
Several European Union countries and Canada were banning or limiting some flights from the U.K. to try to limit any spread.
The one in the U.K. has the two changes and more, including eight to the spike protein, Gupta said.
But vaccines may need fine-tuned over time as changes accumulate, and changes should be more closely monitored, he wrote.