Walgreens has inoculated hundreds of thousands of Americans against COVID-19 this year using the vaccine developed by Pfizer and Germany’s BioNTech. But the pharmacy chain has not been following guidance from federal health officials about the timing of second doses.
People are supposed to get two doses, three weeks apart. Walgreens, however, separated them by four weeks because that made it faster and simpler for the company to schedule appointments.
There is no evidence that separating the doses by an extra week decreases the vaccine’s effectiveness. While the Centers for Disease Control and Prevention recommends a three-week gap, the agency says it is acceptable to separate the doses by
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