Immunity wanes after anywhere from three to six months, experts say.An independent panel of advisers at the Centers for Disease Control and Prevention is recommending that everyone over the age of 6 months get the updated COVID vaccine this fall. "Even children and adults with no underlying conditions can still experience severe illness due to COVID," said Dr. Sandra Fryhofer, an adjunct associate professor of medicine at the Emory University School of Medicine. Most infectious disease experts agree with the recommendations made by the federal health agency. "I agree with the CDC recommendations because it is a simple recommendation to...