4) fecal aerosol transmission recognized? Yes.

➡️9 infections in 3 families due to vertically shared toilet drainage pipes + aerosols from pipes.

To prove it, tracer gas was released into drainage system & shown to come out of other apt.

➡️Fecal airborne is real. #COVID19 pic.twitter.com/yH7GWCBWD7

— Eric Feigl-Ding (@DrEricDing) April 6, 2021