Vaccine Comparison This preprint retrospective study compares the effectiveness of the Moderna (mRNA-1273) and Pfizer/BioNTech (BNT162b2) vaccines from January to July 2021 in the Mayo Clinic Health System. The researchers examine effectiveness during which the highly prevalent waves of either
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Vaccine Effectiveness This observational study evaluates the effectiveness of BNT162b2 (Pfizer vaccine) among health care workers in an area with a high rate of the B.1.1.7 variant in Northern Italy during the time period of January 25, 2021 through April 13,
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