Walgreens to switch second dose of Pfizer COVID vaccine to CDC's recommended timing - USA TODAY

Walgreens will shorten the window between the first dose of Pfizer's COVID vaccine and the second from four weeks to the CDC's recommended three. https://www.usatoday.com/story/money/2021/04/05/walgreens-covid-vaccine-chain-switch-4-week-window-3/7095241002/