Are the New Strains Really More Infectious?
Research shows that the UK strain is anywhere from 56% to 70% more infectious, meaning each individual person who gets the new strain infects 56-70% more people than the older COVID strain. The new variant quickly came to dominate the old strain of COVID in Southeast England, going from less than 1% of all tested samples at the start of November to over two-thirds by mid-December.

Source: Opinion | Should You Be Worried About the New COVID Strains?