I've been wondering this -- what is my likelihood of infection based on vector? If I go shopping and there are 5% people actively infected, how does that compa

I've been wondering this -- what is my likelihood of infection based on vector? If I go shopping and there are 5% people actively infected, how does that compare to living with someone? I've been operating under the assumption that proximity without PPE but within a few hours of existing in the same space is a significant vector. If true, it seems like it'll be very difficult to find people who shopped at the same store within the same day.