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Why are some people superspreaders?

The production of infectious aerosol droplets can vary widely between people. If you look at people expire in cold weather you can see that the size of their breath cloud varies considerably when exhaling. Aerosol droplets are created in the bronchioles of the lungs, the larynx, and the mouth. The shapes of the body, loud talking, and breathing fast all have a major role in spreading the droplets.

Shouting amd singing, especially in Karaoke Bars, have been a big source of superspreading events.  At least forty adults were infected on Aug. 23rd at a Karaoke Bar in Quebec City and then they passed it along to 10 family members. 

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An aerosol is any particle that can be suspended in air for minutes to hours - and are usually less than 100 micrometers in size. The respiratory fluid in the lungs create a film that bursts like soap bubbles as the bronchioles and larynx expand and contract. All the aerosols and droplets are trapped in an explosive puff of gas which carries them into the air. Superspreaders produce an order of magnitude more than other people even when talking. This may be due to variations in the thickness of their respiratory fluid. This field of science is difficult but advancing rapidly during the SARS-CoV-2 epidemic. (National Geographic October 2020)

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