Repetition

There is continuing confusion as to why so many people are testing more than once for Covid-19.

Perhaps I can help ?  Most senior hospital doctors have got a pretty good handle on what a Covid-19 patient looks like, and when the first test comes back negative, they try again, and often again.

Equally, at the other end, when Covid-19 patients seem well enough to come out of intensive care, two or three tests are used to make sure the ICU teams' hard work (and the patients' resilience) doesn't go to waste.