As part of National Influenza Vaccination Week, the AHA will host a United Against the Flu Twitter chat Dec. 4 from 11 a.m.-noon ET. Jay Bhatt, D.O., AHA senior vice president and chief medical officer, an expert from the Centers for Disease Control and Prevention, and other flu campaign partners will answer questions about the flu and vaccinations. Join in by following @ahahospitals and using the hashtags #UnitedAgainstFlu and #NIVW2017. For more on the United Against the Flu campaign, visit