September 24, 2021

A second dose of Pfizer can be used after a first dose of AstraZeneca in some situations.

Research is underway to understand whether COVID-19 vaccines can be safely and effectively to mixed-and-matched. Emerging data shows that following a first dose of AstraZeneca with a second dose of an mRNA vaccine(Pfizer or Moderna) is safe and effective where supply is limited.

Source by worldhealthorganization

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