Pfizer-BioNTech and AstraZeneca vaccines offer high protection against severe COVID-19, 6 months after second doses

Protection against severe COVID-19 by two doses of Pfizer-BioNTech and AstraZeneca COVID-19 vaccines remained high up to six months after second doses, finds new research which analysed NHS health record data on over seven million adults. Reassuringly, the University of Bristol-led study published in The BMJ today, found protection in older adults aged over 65 years, and in clinically vulnerable adults.

source https://medicalxpress.com/news/2022-07-pfizer-biontech-astrazeneca-vaccines-high-severe.html