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Wall Street Journal: Vaccine mix study suggests combinations safe and effective

By Wall Street Journal.
Workers unload the batch of the Pfizer/BioNTech COVID-19 vaccine on May 26, 2021 at the Igor Sikorsky Kyiv International Airport (Zhuliany).
Photo by Volodymyr Petrov

Alternating a dose of Covid-19 vaccine made by Pfizer Inc. with one from AstraZeneca PLC is safe and provides a strong immune response against the disease, a new study shows.

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