You're confusing two different things - "how the virus is caught" with "probability of catching the virus"
Try some technical reading such as https://www.bmj.com/content/370/bmj.m3223
You're confusing two different things - "how the virus is caught" with "probability of catching the virus"
Try some technical reading such as https://www.bmj.com/content/370/bmj.m3223