What is a dangerous temperature in adults?

[SomethingOnce]

I can’t find a definitive answer on the NHS website.

Sorry if I’m being thick/missed it.

Over 39 is high. Over 40 I would start to get concerned. Over 41 I would be seeking medical advice.

For self isolation purposes it's 37.8 and over.

Do you mean “no other major symptoms, but dangerous in its own right?”

That said here is what nhs says about heat stroke including temperature over 40: www.nhs.uk/conditions/heat-exhaustion-heatstroke/

37.8 for self-isolation purposes

Apologies for not coming back to the thread sooner - we had a 39.4er in the house (adult) when I started it.

Now we’ve a DC with a temp of 37.8 at bedtime this evening, after a slight cough during the day (sleeping happily now).

Thank you, everyone, for the helpful replies x