Just curious really. Someone I know works in a 'closed' environment where there was a small outbreak of covid-19 and they were able to trace and isolate every case - a domino-track of workers who came into close contact, plus one more who changed a lightbulb in someone's living quarters and is thought to have caught it from the lightswitch. So, as we've been in lockdown for so long, I'm wondering if people who've developed symptoms very recently might have some strong suspicions around where they got it - a passing sneeze in a supermarket, a visit to a hospital, an illicit visit to a friend, etc etc.
Conversely, if people are completely at a loss to explain it, and have been following all the rules, that's interesting too ... it perhaps justifies all the advice which I followed at first but rapidly tired of about disinfecting your shopping, wiping down your letterbox etc etc.