The Centers for Disease Control and Prevention identified a possible safety issue with Pfizer’s updated COVID-19 vaccine but is still advising people to get boosted.

Senior fellow at the Cato Institute Dr. Jeffrey Singer joined The National Desk’s Scott Thuman Monday morning to discuss the immunizations.

The CDC and the FDA on Friday said they plan to investigate a preliminary safety signal of a possible increase in a certain kind of stroke in people 65 and older who recently got one of the updated Pfizer boosters.

They reported that they had a preliminary safety signal which means it’s some kind of a possibility that it might cause what they call an ischemic stroke,” Singer said. “It’s very preliminary and in fact they haven’t seen this in a European CDC so we don’t know that this is really a fact yet. They’re looking into it.”

The CDC is still recommending people get boosted even if there is a potential health risk, but some are wondering if the pros outweigh the cons.