The pharmacy giant has been administering the second shot of the two-dose regime four weeks after giving the first one — because it was easier for the company to schedule at the same interval as the Moderna vaccine, the New York Times said.
But the federal Centers for Disease Control and Prevention called out the company — noting that the vaccine’s second dose should really be administered three weeks after the first, although the agency acknowledged that it is still acceptable to extend that window to six weeks when necessary.
There is no indication that the week’s lag of the second shot affects the vaccine’s overall effectiveness.
A man receives the COVID-19 vaccination at a Walgreens pharmacy in Danvers, Massachusetts.Pat Greenhouse/The Boston Globe via Getty Images
But Walgreens agreed to make the switch to three