Covid: how the protection of Pfizer and Astrazeneca weakens over the months

  • Michelle Roberts
  • Health publisher, BBC News online

Photo credit, FatCamera

Researchers say they see a decrease in protection against Covid-19 infections in people who have received both doses of the vaccine.

A study, conducted in the UK using real data, examines positive PCR results between May and July 2021 in more than one million people who received two doses of the Pfizer or AstraZeneca vaccine.

Protection after two doses of Pfizer increased from 88% in one month to 74% in five to six months. For AstraZeneca, the drop is 77% to 67% in four to five months.

To read especially on BBC Africa:

Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.