Most other major pharmacies, including CVS and Rite Aid, stuck with the C.D.C.’s guidance on the timing of second doses. CVS, for example, schedules second Pfizer shots for 20 to 23 days after the first shot, said T.J. Crawford, a spokesman for the chain. Some public health experts believe the United States should delay the second doses of vaccines by longer than Walgreens has been doing with the Pfizer vaccine. It is largely arbitrary that Pfizer’s and Moderna’s vaccines, which both use similar “messenger RNA” technology, have different dosing schedules. Walgreens’ decision to not adhere to the C.D.C.’s guidance on dose spacing for Pfizer’s shot left some customers confused.

Source: New York Times April 05, 2021 14:37 UTC