40 million adults who work or live with children at risk for severe COVID-19A research letter published late last week in the Annals of Internal Medicine has found that about 40 million US adults who work or live with school-aged children have definite or possible risk factors for severe COVID-19, carrying implications for fall school reopenings.Researchers from Harvard Medical School and City University of New York at Hunter College who analyzed representative data from the 2018 National Health Interview Survey showed that 2.9 million of 5.8 million K-12 teachers (50.6%) had definite or possible risk factors for serious coronavirus illness, including obesity (32.1%), heart conditions (8.0%), and cancer (0.7%).