"We really need to make patients aware that this is not going to be a walk in the park. They are going to know they had a vaccine. They are probably not going to feel wonderful. But they’ve got to come back for that second dose."

Dr. Sandra Fryhofer of the American Medical Association, talking about the Covid-19 vaccines developed by Pfizer and Moderna during a recent virtual meeting with the Advisory Committee on Immunization Practices, or ACIP, an outside group of medical experts who advise the CDC, as reported by CNBC in its health and science story about the side effects from Covid vaccine shots.