New COVID test shortages and delays evoke comparisons to earlier pandemic days … COVID long-haulers at risk for substantial kidney decline … Half of COVID survivors have at least 1 symptom a year later: study … Extended release drug succeeds in reducing Parkinson’s “off” episodes, late stage trial finds … Deficits may remain after 7-day recovery from 10 days of insufficient sleepHandful of walnuts a day boosts cardiovascular health, investigators say