METHODS
The sagittal plane dispersal patterns of respiratory droplets were captured using a digital camera (Panasonic Lumix GH4) at 60 frames per second in a low-airflow light-controlled laboratory. Illumination was provided through a green laser light (535 nm wavelength, 20 mW, 30 centimeter beam-size). To visualize the droplets’ trajectories, we combined the relevant frames into one image.
Nasal, nasopharyngeal, and oral swab testing were first performed, followed by nasoendoscopy with and without cophenylcaine spray decongestion, on three volunteers. Manoeuvers performed during nasoendoscopy included swallow, tongue protrusion, vocalization, cough, and sneeze.