I just wanted to say, "Viral load"
The dose matters in determining whether an infection can take hold and seemingly how severe the resulting disease will be.
https://www.galaxydx.com/pathogen-infectious-dose-and-the-risk-of-vector-borne-disease-transmission/
The main sources for infection are home, workplace, public transport, social gatherings, and restaurants. This accounts for 90% of all transmission events. In contrast, outbreaks spread from shopping appear to be responsible for a small percentage of traced infections
https://www.medrxiv.org/content/10.1101/2020.04.04.20053058v1.full.pdf
If I am outside, and I walk past someone, remember it is “dose and time” needed for infection. You would have to be in their airstream for 5+ minutes for a chance of infection.