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Can Covid-19 spread through your apartment building's pipes
[...]
Dr. Leana Wen, the former Baltimore health commissioner, said currently there is no evidence that the coronavirus can spread long distances.
However, she added that the virus could spread through a defective plumbing system. This was a particular concern in Hong Kong. During the 2003 severe acute respiratory syndrome (SARS) outbreak, this method became a major source of transmission. At the Amoy Gardens housing estate, there were more than 300 infections and 42 deaths after defective plumbing allowed the virus to spread through the building.
Dr. Wen recommended that "buildings should make sure that they check their exhaust systems, their pipe systems. And I think for all of us who live in apartment buildings, there are additional steps you can take as well, including don't get into crowded elevators. Try to make sure you are not in an elevator with someone."
Dr. Wen also recommended opening the windows to increase your own ventilation once the weather gets warmer and to wash your hands thoroughly after touching surfaces that are used often, like handrails or buttons in elevators.
Coronavirus live updates: Cases top 1 million globally - CNN

[...]
Dr. Leana Wen, the former Baltimore health commissioner, said currently there is no evidence that the coronavirus can spread long distances.
However, she added that the virus could spread through a defective plumbing system. This was a particular concern in Hong Kong. During the 2003 severe acute respiratory syndrome (SARS) outbreak, this method became a major source of transmission. At the Amoy Gardens housing estate, there were more than 300 infections and 42 deaths after defective plumbing allowed the virus to spread through the building.
Dr. Wen recommended that "buildings should make sure that they check their exhaust systems, their pipe systems. And I think for all of us who live in apartment buildings, there are additional steps you can take as well, including don't get into crowded elevators. Try to make sure you are not in an elevator with someone."
Dr. Wen also recommended opening the windows to increase your own ventilation once the weather gets warmer and to wash your hands thoroughly after touching surfaces that are used often, like handrails or buttons in elevators.
Coronavirus live updates: Cases top 1 million globally - CNN