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?”
Thomas said even though protection from vaccination may decline over time, it’s important to focus on the relative risk posed by a Covid-19 infection.
“I would kind of focus people on the point here, that the public health burden of Covid is severe disease, hospitalization and death,” he said. “Even though these vaccine immune responses wane over time, they are very, very effective at preventing those three outcomes.”