A mix-and-match approach to #COVID19vaccines is safe and effective, and some combinations even improve upon immune responses: UK researchers
They studied 1,079 volunteers whose first shot was either adenoviral vector vaccine from AstraZeneca or mRNA vaccine from Pfizer/BioNTech pic.twitter.com/hRGrq3l7UK— DD News (@DDNewslive) December 9, 2021
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