Pfizer and BioNTech Pause Covid Vaccine Study Following Low Enrollment Totals P3
April 3, 2026
Source: Pharm Exec
Photo / Image Source: Unsplash,
What happened and why?
According to a report from Reuters, in a letter to trial investigators dated March 30, Pfizer said it would stop surveillance for Covid illness among all study participants after April 3, following a enrollment closure on March 6.1
The trial had aimed to enroll roughly 25,000 to 30,000 healthy adults aged 50 to 64, a population the FDA specifically required to be studied in a large, placebo-controlled trial before the vaccine could be included in recommendations for that group.

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