Long-Term COVID-19 Vaccine Studies Hampered As Placebo Recipients Get Real Shot

Scientists are trying to learn more about COVID-19 vaccines from original study participants. That quest is hampered because many people who received a placebo shot have now opted to get the vaccine.

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source https://www.npr.org/2021/02/17/968760642/long-term-covid-19-vaccine-studies-hampered-as-placebo-recipients-get-real-shot