In the Herald today, based on Scottish Government figures released ‘after being pressed by the Herald’ (Don’t snigger):

It also means six per cent of all of Scotland’s confirmed Covid cases first became ill in hospital after being admitted for a different reason.

A quick search finds these NHS England figures in the Guardian on 17th May:

Up to 20% of hospital patients with Covid-19 caught it at hospital. Up to a fifth of patients with Covid-19 in several hospitals contracted the disease over the course of the pandemic while already being treated there for another illness, NHS bosses have told senior doctors and nurses.

Outsourced cleaning?

Do the arithmetic?