[excuse-me]

100 years ago patients died because of doctor's neck ties. He would lean over one patient with the tie dragging on their wound, then go to the next patient transferring the infection

Of course we are far too advanced to do anything so stupid today.

Now we examine a patient, go to the computer at the nurses station and type up the results, then the nurse comes along and rubs their hand over the keyboard and mouse, then you go the next patient ....

You can get washable waterproof medical keyboards but they are expensive, and get broken and replaced with whatever IT have on the shelf. Funnily enough I have never seen a waterproof mouse.