I believe most hospitals had patients were in isolation wards. Seems they use negative air pressure to prevent the spread of airborne diseases. [1]

Considering that diseases which spread through the air existed long before Covid wouldn't it be obvious that hospitals would be properly set up to isolate patients and avoid infecting visitors and people at the hospital for other reasons?

[1]https://www.csemag.com/articles/why-indoor-air-quality-matte...