Our colleague Donald G. McNeil Jr., who covers science for The Times, told The Daily podcast that when people talk or laugh, they create an “invisible mist” or a “droplet cloud” of tiny particles that floats around near their head. That fog can hold enough virus to transmit the disease; walking into it is akin to someone “spitting on your face.”
Indoors, without a breeze, the cloud can drift across a room, like in a bar or at a cocktail party, at more or less head level, he said, to be inhaled by revelers until 20, 30 or 40 people are infected.
Evidence is also mounting, Donald said, that Covid-19 is more of a blood vessel disease than a respiratory disease. While the virus enters the body through the lungs, it seems to do its damage by attaching to the insides of blood vessels, infecting organs, like the kidneys and the brain, with lots of fine blood vessels.
“When they do autopsies, they find thousands of tiny little blood clots all over the body,” Donald said. That explains why some patients may experience strokes, dementia and disorientation — and why children and young adults have experienced so-called Covid toe.
Four New Insights About the Coronavirus - Transcript