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@silentpl: https://www.bbc.com/future/article/20210114-covid-19-how-effective-is-a-single-vaccine-dose 52% pierwsza dawka dokladnie

According to Pfizer data published in December 2020, the Pfizer-BioNTech vaccine is roughly 52% effective after the first dose. Out of 36,523 #!$%@? in the phase three trial – the final stage of testing where people either received two full doses, 21 days apart, or a placebo – who had no evidence of existing infection, 82 people in the placebo group and 39 in the