The efficacy of the Pfizer BioNTech vaccine in preventing Covid-19 infections has declined by nearly a third in Israel

💉The efficacy of the Pfizer BioNTech vaccine in preventing Covid-19 infections has declined by nearly a third in Israel - largely due to the spread of the delta variant https://t.co/mUWyjznfPm

— The Telegraph (@Telegraph) July 5, 2021