The HHS statement did not mention Pfizer by name but said “a science-based, rigorous process” headed by the Centers for Disease Control and Prevention, the Food and Drug Administration and the National Institutes of Health would determine whether boosters were necessary. The decision, the statement said, will be only partly informed by data from drug companies. It underscored that the current data shows fully vaccinated people are protected against severe illness, even from the most challenging known variants.