Pediatricians are hearing both “excess of concern and excess of lack of concern,” he said, with some parents going — or feeling pushed — to extremes: “‘My child is absolutely fine and doesn’t need to do any of these things,’ or ‘my child is going to die if they spend five minutes within 20 feet of a stranger.

“Our biggest worry is Covid-19 fatigue,” a coronavirus expert says. “People are losing respect for the virus and letting their guard down, which is a bad idea.”

For the past 20 years, when patients asked me about exercising while recovering from a viral illness like the flu, I gave them the same advice: Listen to your body. If exercise usually makes you feel better, go for it.

Two new studies found little downside to donning masks during vigorous exercise. And wearing a mask may do much good.

With coronavirus cases raging across the U.S., holiday food shopping just got more complicated. We asked the experts for advice.