My neighbours have 7 kids, 3 are school age, 4 are over 18 (3 of the 4 have moved out). Each week, the 3 return to the family home. I've then seen the 3 get picked up outside by partners sometimes or bring their kids to see their grandad/grandma etc. On top of that he's a trader, so has various different people coming into the house. I've seen them have friends over with their kids. The people they interact with do the same. No wonder we are fucked.
I see similar here, so you can by that analysis deduce that this is and has been the same throughout the country for months. In my area I haven't heard of or seen any of these visitors or grandparents becoming ill as a result. So as strange as that sounds perhaps it is a kind of positive sign? That millions have been mixing unbeknown to the authorities for months and not been infected.