Training not enough to reduce hospitalization, ED visits in end-of-life careBreakthrough infections may be less transmissible, study in healthcare workers suggests … Wider vaccine approvals on the way; COVID may be under control by 2022, Fauci predicts … Good hydration may prevent heart failure, federal researchers find … COVID transmission risk greatest 2 to 3 days around symptoms onset … Five-minute cognitive assessment has promising results in validity study, developer says