Pfizer and BioNTech Pause Covid Vaccine Study Following Low Enrollment Totals P2

By Nicholas Jacobus

April 3, 2026

Source: Pharm Exec

Photo / Image Source: Unsplash,

Key Takeaways

Pfizer and BioNTech halted a large U.S. clinical trial targeting healthy adults aged 50 to 64 after enrollment shortfalls made it impossible to generate the post-marketing data the FDA required.

Both company’s say the enrollment was too low to collect the required data.Stock.Adobe.com

Pfizer and BioNTech halted a large U.S. clinical trial of their updated Covid-19 vaccine in healthy adults aged 50 to 64.

Both companies say enrollment shortfalls made it impossible to generate the data required by FDA to potentially expand the vaccine's recommended use to that age group.

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