New measure aims to protect senior living residents from waterborne illnesses … Spinal anesthesia tied to more painkiller use after hip fracture surgery … Deep brain stimulation reduces gait freezing in Parkinson’s, study finds … CDC: Faster-spreading omicron subvariants account for 21% of COVID variants in U.S. … Opioid use for chronic pain has fallen since CDC’s 2016 guidance released, report finds