WHO Director calls on U.S. and other wealthy countries to hold off on booster shots … NIH adds two new centers to its research network of Alzheimer’s and related dementias … 83% of blood donors have vaccine antibodies, investigators find … 3 surprising trends in seniors’ telemedicine use during pandemic … Patients treated by mobile stroke units had better outcomes: study … These 7 walking strategies may benefit patients with Parkinson’s: study