Fig. 1

Cough maximal plume areas of the four respiratory etiquette maneuvers. Summary of cough maximal plume area (MPA) for anonymized participant 4 across all four respiratory etiquette maneuvers from the slow-motion videos. Each still image is annotated with the software detected maximal plume pixel boundary (pink outline). The unobstructed cough maximal plume area (MPA) is much bigger in area than the other maneuvers. The elbow maneuver produces a dense cloud of dust, whereas the mask and shirt maneuvers reduce the number of released particulates