COVID-19 risk calculators

• Going Out and Worried About Covid Safety? There’s a Calculator for That. Alyson Krueger, NY Times, Dec. 30, 2021. Age + vaccination status + number of guests + ZIP code + activity = Should I even leave the house?
   
• My COVID-19 visit risk calculator National Institute on Ageing, Canada
   
• COVID-19 Indoor Safety Guideline Kasim Khan, John W. M. Bush, and Martin Z. Bazant