TL;DNR: Keeping the humidity at 40-60% dramatically decreases airborne infection rates!
Here are snippets from an article in Forbes, shown to me by Winnie Chen.
Oct 17, 2019, 09:30am
This Inexpensive Action Lowers Hospital Infections And Protects Against Flu Season
“Harvard Medical School graduate and lecturer, Stephanie Taylor” heads this research…
“The one factor most associated with infection was (drum roll): dry air.”
“Taylor finds one of the most interesting studies from a team at the Mayo Clinic, which humidified half of the classrooms in a preschool and left the other half alone over three months during the winter. Influenza-related absenteeism in the humidified classrooms was two-thirds lower than in the standard classrooms—a dramatic difference.”
“They used to assume the microbes in desiccated droplets were dead, but advances in the past several years changed that thinking.”