> Why haven’t we already seen the same kind of transformation with respiratory viruses?

Because it’s a lot easier to control the supply of a material that has to be actively transported into people’s houses for them to use? I struggle to take them seriously when I didn’t see this basic and fundamental difference even mentioned.

Came here to say the same thing. It's simple to clean all the water you consume, cleaning all the air you breathe is impossible unless you want to walk around like Bane. Bizarre that they don't mention this when comparing respiratory infections to waterborne infections.