Ventilation vs Vaccination for COVID-19

Fresh-air ventilation has been determined by a medical study to have an effect similar to the effect of vaccination. The cost-effective and proven way to achieve it is Passive House for all buildings. Cornell University is building a 26-story Passive House dormitory in New York City. CDC says 100% fresh air is best. Conventional buildings will use 6 times more energy. Passive House one-twelfth normal conventional use.