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Fecal aerosols... 9 infections in 3 families due to vertically shared toilet drainage pipes + aerosols from pipes.To even prove it, tracer gas was released into drainage system of one unit & shown to come out of the other.
Fecal airborne transmission is real. #COVID19 https://twitter.com/alinouriphd/status/1342232561205047301
2) Potential scenario is infection through drainage system. U-traps typically act as water seals in each bathroom. But they can dry out if unused allowing aerosols from one unit to travel to another.
3) Thus is an amazingly detailed epidemiological study. They ruled out all other forms of transmission because the infected families had no other contact in their high rise. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7464151/
4) was it from elevator or ventilation ducts? Unlikely, because a) people who shared elevator but not part of same vertical drain pipe didn’t get infected. And b) the PCR tests of the building was negative in elector and ventilation. But positive for bathrooms.
5) Also remember your bathtubs and floor drains you don’t use often—their U-shaped drain is not visible like a sink’s is. And they can get dried out over time very easily. Thus, your rarely used floor drain and unused baths are just as risky.
6) Don’t believe it? Well we know it’s happened before with the old SARS Coronavirus outbreak in 2003 in Hong Kong Amoy Gardens. Basically same thing happened that led to that outbreak.
https://pubmed.ncbi.nlm.nih.gov/16696450/
https://pubmed.ncbi.nlm.nih.gov/16696450/
7) At SARS outbreak at Amoy Gardens high rise famously led to 300 cases of the old SARS Coronavirus it was infamous!
Most of the initial 107 patients from Block E (of the high rises) lived in flats that were vertically arranged.
History repeats.
https://en.m.wikipedia.org/wiki/Amoy_Gardens
Most of the initial 107 patients from Block E (of the high rises) lived in flats that were vertically arranged.
History repeats.
https://en.m.wikipedia.org/wiki/Amoy_Gardens
8) This fecal aerosol outbreak AGAIN happened in Feb 2020 during Hong Kong’s first wave, in another HK high rise. History not only rhymes, it also directly repeats. https://twitter.com/jljcolorado/status/1286666919869726728
9) This was my Feb 10 2020 warning on the Hong Kong high rise evacuation based on @carlquintanilla’s reporting of the toilet vent pipe issue. Remember those early days Carl? https://twitter.com/drericding/status/1226916423555047425
10) there’s been many other fecal related transmissions. Not all aerosols, but just further confirms the fecal risk. Here is another sewage pipe leak #COVID19 study. https://twitter.com/drericding/status/1317262198520020994
11) Dr Fauci had warned both of fecal and of airborne aerosol transmissions separately before too. Their combination is thus very plausible. 
https://twitter.com/drericding/status/1309829079152111616
https://twitter.com/drericding/status/1309829079152111616
