Update on vaccine efficacy from PHE/NHS stats.
https://assets.publishing.service.g...741/Vaccine_surveillance_report_-_week_23.pdf
Vaccine effectiveness against the Delta (India/B.1.617.2) variant:
Dose 1 33.2% (25.8 to 39.9) Dose 2 88.4% (85.7 to 90.7) 80.8 (76.3 to 84.4)
Those are down from 50.2% Dose 1, 88.4% against the Alpha (Kent/B.1.1.7)variant
Those are against any symptomatic infection.
In terms of hospitalisations the protection is stronger. These stats are still mostly based on effectiveness against the Alpha variant though, but early indications on the Delta variant are that it's similar after two doses:
" Several studies have estimated the effectiveness against hospitalisation in older adults, all of which indicate higher levels of protection against hospitalisation after a single dose than that seen against symptomatic disease, around 75 to 85% after 1 dose of the Pfizer-BioNTech or Oxford-AstraZeneca vaccine (3, 8, 9, 10). Data on 2 doses is only currently available for the Pfizer-BioNTech vaccine and indicates effectiveness against hospitalisation of around 90 to 95% (10). "
Summary: vaccines work.