Fig. 3.

(Color Online) Simulated dispersion of fine droplets exhaled from index case A1 (purple), which are initially confined within the cloud envelope (ABC bubble) due to the zoned air-conditioning arrangement. The fine droplets disperse into the other zone via air exchange and are eventually removed via the restroom exhaust fan. The streamlines originated from the ABC air conditioning unit are plotted to show the formation of the ABC bubble. The ABC zone clearly has a higher concentration of fine droplets than the non-ABC zone. Other infected patients are shown in red and non-infected patrons in gold. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)