I think that you're infected and infectious for around 5 days before you get any symptoms. That's why it's spreading so quickly (although I've still not seen anyone with it, a few friends of friends but no direct friends or family members).
I had one customer on Friday and two random strangers on Saturday all in the 60+ age group and coughing like mad, they seemed happy to mingle in close proximity to anyone without precaution, including me!
Ive had a cough for last several months and since a couple of years back when i had a bad flu, its seems every winter/cold time I get this cough.
I aint going to carry a sign saying "dont worry I aint got corona virus, Ive had this cough longer than the virus came out!"
Likewise for some old dears I know, some have asthma and them coughing is part n parcel of what they have, sadly. Or should we judge everyone now with a cough suspiciously........