I have just mentioned this on another thread.
I would imagine a high number of those isolating at the moment just have a regular cough.
So many are convinced they have Covid19.
They will be back out soon if we do not lockdown.
When they get another dry cough, will they be trusted to re-isolate or will they be convinced they are fine and spread the virus.
Even if lockdown is implemented people will need to shop and could go spreading thinking they are immune.
There is also the hypochondriac factor.
Lots of people are suggestable and will convince themselves they have symptoms.