Another study shows Pfizer mRNA vaccine immunity is reduced over time.

Waning of BNT162b2 vaccine protection against SARS-CoV-2 infection in Qatar – medRxiv

Related:

[Press release – not published yet] Study shows vaccine protection wanes over time, but vaccines still offer good protection against severe disease.

Studies: COVID vaccine protection waning against infection but not hospitalization.

Pfizer says it’s time for a Covid booster; FDA and CDC say not so fast.

Commentary on Twitter (thread – click for more)

The evidence of mRNA vaccine effectiveness (VE) waning grows: large Qatar experience shows substantial 5 month attrition for symptomatic infection VE below 50% and, to a lesser extent, vs hospitalization and deathhttps://t.co/4lIG68Bxm0 pic.twitter.com/rnyo0Si3RP

— Eric Topol (@EricTopol) August 27, 2021