Covid-19 roundup: Pfiz­er vac­cine's ef­fec­tive­ness de­clines faster than As­traZeneca, UK study finds; What about J&J boost­ers?

Two dos­es of Pfiz­er-BioN­Tech have greater ini­tial ef­fec­tive­ness against new Covid-19 in­fec­tions, but this ef­fec­tive­ness de­clines faster than two dos­es of Ox­ford-As­traZeneca, ac­cord­ing to a new study from re­searchers at Ox­ford.

The re­sults from this large com­mu­ni­ty sur­veil­lance study, which looked at PCR re­sults from more than 700,000 dur­ing both the Al­pha- and Delta-dom­i­nant pe­ri­ods, showed that vac­ci­na­tion with two dos­es of both the Pfiz­er and As­traZeneca Covid-19 vac­cines still sig­nif­i­cant­ly re­duce the risk of new in­fec­tions.

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