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Pfizer & BioNTech halt recruitment for a major U.S. COVID vaccine trial for adults 50–64 due to low enrollment. Read the latest updates.
https://www.bloomberg.com/news/articles/2026-04-01/pfizer-wins-1-9-billion-covid-vaccine-case-with-poland-romania
Vaccine makers Pfizer PFE.N and BioNTech 22UAy.DE have halted recruitment for a large U.S. trial of their updated COVID-19 vaccine in healthy adults aged 50 to 64, saying enrollment in the trials had been too low to generate the needed data.
https://www.shionogi.com/global/en/news/2026/04/20260401_12.html