Last Friday a friend and I met up and we went shopping at an Asian market and then at a Persian one.  She told me she was making lunch and I shouldn't bring anything - we ate that lunch together on a picnic table outside a winery where we tasted samples.  (I had brought her home grown potatoes and quail eggs.)   We then went to a dedicated sausage making facility and then - we parted and I drove home.
Of course, we didn't wear masks while eating, and we were probably 3 feet across from  each other.  She mentioned she felt achy from heavy duty gardening that Thursday.   Makes sense, I thought.
She's come down with everything that sounds like full-blown COVID since then.  She was tested, and the test turned up negative, but the testing turns up loads of false positives and false negatives.  She's had lung x-rays and further testings.  The doctors are considering it "putative/potential" Covid-19 but not a firm diagnosis.
I am in my own self-made self-quarantine.  I'm not getting tested until I show symptoms - it is Day 6 of the quarantine for me.  I was able to buy chicken feed on Day 2 by going to the website and ordering/paying for it - and the staff delivered to the trunk of my car.   I AM worried and concerned - and I am not going to take a chance of inflicting this on others at this point.  (Or, frankly. any.)
She's severely worried about her possibly having passed this on to me - I told her don't worry, I'm not.   (Actually I am, but it's not her fault and she doesn't need to know this at this point for her.   We cannot change the past.)
PS: today I am feeling fine, day 6.