Uğur Şahin, BioNTech CEO (Bernd von Jutrczenka/dpa via AP Images)
Covid-19 roundup: Pfizer/BioNTech add on vaccine data for young children; Mexico says it's missing vaccine doses from UN
A three-dose vaccine series was 73.2% effective in preventing Covid-19 for children between 6 months and 4 years old, Pfizer and …
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