It’s “conceivable” that a 4th dose of COVID-19 vaccine will be recommended to protect against Omicron variant. So we’re going to take one step at a time, get the data from the third boost and then make decisions based on scientific data: US Chief Medical Adviser Anthony Fauci pic.twitter.com/5qMsJaUKRp

— ANI (@ANI) February 10, 2022