How quickly do I need a second COVID-19 vaccine shot?

How quickly do I need a second COVID-19 vaccine shot? AP Illustration/Peter Hamlin

NEW YORK — New research suggests the COVID-19 vaccine made by Pfizer and BioNTech can still work against a mutated coronavirus.

Two variants -- one discovered in Britain, the other in South Africa -- share a common mutation that's believed to be the reason they are more contagious. Called N501Y, it is a slight alteration on one spot of the spike protein that coats the virus.

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