Editor’s note: Find the latest news and advice on COVID-19 in Medscape’s Coronavirus Resource Center. LISBON, Portugal – An overall nine-fold increase in COVID-19 antibody levels can be seen with a longer interval between the first and second dose of the Pfizer/BioNTech vaccine (BNT162b2) in people without previous infection, according to UK government SIREN (SARS-CoV-2…
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