Dr. Kevin Ban, the chief medical officer of Walgreens, joined Cheddar’s "Opening Bell" to talk about administering Pfizer COVID-19 booster shots for eligible candidates in its pharmacies, and dealing with ineligible customers who might try to acquire the third shot. He also discussed the difference between boosters and a third vaccine dose, which has been reserved for immunocompromised individuals. Ban added he expects full reviews for Moderna and Johnson & Johnson booster programs, but emphasized that the current booster shot is only for those who received the Pfizer-BioNTech vaccine.