@artemis Also, for anyone who manages or has some control over a public indoor space: clean the air! Use HEPA air purifiers or Corsi-Rosenthal boxes and make sure you have fresh filters. Make sure your building HVAC system is bringing in outside air and running with the highest MERV level filter it can handle. Check CO2 levels. There's plenty of info out there on how to improve & monitor indoor air quality, but even doing just a little is better than nothing and may prevent a few illnesses.