“I think there is a real risk that we will see a decrease in the effectiveness of the vaccines,” Hoag said in an interview with ABC.
He clarified that he did not know how significant the reduction would be and whether vaccines would need to be updated.
The President also expressed the hope that the coronavirus pandemic will end in 2022.
Earlier it became known that a new strain of coronavirus infection "omicron" could acquire one of its mutations by taking a fragment of the genetic material of the virus causing the common cold.