It's normal for vaccine immunity to decline over time, Pfizer researcher says
From CNN's Virginia Langmaid
It is “not unusual” for vaccine-induced immunity to wane over time in the world of vaccine production, Dr. Stephen Thomas, coordinating principal investigator for Pfizer/BioNTech’s vaccine trial, said Friday.
“For those of us that have been making vaccines for a long time, it is not unusual for immune responses after vaccination to wane over time,” Thomas told CNN. “What is the crucial point though, and which we don’t know the answer to right now is, even though that immunity wanes over time, does it remain above a level which we need to protect people?”