Airflow and Masks Proved Key in Stopping Flu Spread in Indoor Trial

In a controlled hotel-room study with five influenza patients and 11 healthy volunteers, close face-to-face contact did not result in transmission, likely due to limited coughing, rapid mixing and dilution of airborne virus, and possibly age-related protection; the findings underscore ventilation, air movement, and masking as effective defenses against indoor flu spread and could inform infection-control guidelines.