Quote:
Originally Posted by Traum
My memory is a little hazy on the details, so this probably isn't 100% accurate. From what I can remember though, in one of the vertical transmission cases, the U-joint at the bottom of the waste water pipe wasn't installed correctly, or was somehow defectively installed, so it was exactly as CB has said. In another case, the waste water pipes on the outside of the building, but still within this "sky well" structure, was poorly maintained.
Even back in the SARS days, there was vertical transmission incidents happening in Hong Kong as well (Amoy Gardens), though I don't remember the details of that anymore since it was so long ago (2003?).
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Yup that's what happened at Amoy, the u-pipes were drying out. So essentially a vertical row of all the flats had free airflow between them, in the bathrooms. That's how they had the biggest SARS outbreak at the time.
So far I think it has happened with Covid once at another residence.
Poo carries a lot of the virus, so bathrooms can be a pretty big place to spread it. They tell you to close the lid when you flush, but I have just been avoiding public bathrooms entirely.