Vaccine less protective but very beneficial vs Delta SARS-CoV-2 variantCOVID-19 vaccine effectiveness (VE) against the Delta (B1617.2) variant was 65% in those fully vaccinated, according to a population-based study in Norway.
The results, published in Eurosurveillance yesterday, looked at 4,204,859 infected adults without previous COVID-19 from mid-April to mid-August.Of the cohort, 0.13% had sequences indicating the Delta variant, of which 29.6% were partly vaccinated and 10.3% were fully vaccinated.
VE against Delta of the available vaccines—Pfizer/BioNTech, Moderna, AstraZeneca/Oxford, or a mix—was 22.4% after partial vaccination and 64.6% after full vaccination (95% confidence intervals, 17.0% to 27.4% and 60.6% to 68.2%,