Because none of the nursing staff put anything in a syringe when treating patients with ebola.
Or start pic lines. Or intubate them. Or change their diapers. Or do any number of other caring things for them. And none of the patients ever have violent seizures that eject virus laden liquids to any and all parts of the room.
And the hospitals having level 4 is the problem. According to the CDC, every hospital can treat ebola patients successfully with level 2 procedures and a private room.
Clearly that’s not the case.
The question is why the disconnect between what THEY practice in a strictly controlled environment and what they recommend healthworkers use in a real world setting...
Eventually you have to draw the line at what is possible. Setting up level 4 situations in hospitals is way outside of that realm. Remember level 4 includes positive pressure suits and all the external ventilation that implies. Nursing is actually a dangerous profession, people don’t realize that, but it is. There’s a reason they show up on all the disease risk groups, AIDS, hep C, herpes. You name it, nurses get it. It’s unfortunate, but there’s no way around it.