June 15, 2021 - ICI Toronto

Is herd immunity threatened by the Delta variant?

Public health and several experts in immunology consider that it is essential to accelerate the administration of the second dose of vaccines to counter the spread of the Delta variant.

The latest estimates put forward by Dr. Nathan Stall, NIA Associate Fellow and Assistant Scientific Director the Scientific Advisory Table show that protection is 30 to 40% effective after the first injection, and rises to 70 to 80% with the second dose.