1. The wife and myself have had one monster of a cold for the last two weeks. Getting over it now. 2. We put ourselves in a self mandated quarantine 3. Our neighbor does not need this cold. He is over 70 and she just had cancer surgery. 4. My neighbor and I had an across the fence conversation the other day. When he approached the fence, I moved back about 15 or 20 feet and tried to stay down wind of him. I was trying to prevent him from catching any of the virus I know I was exuding. With all that said, I got to thinking about what distance you need from someone to keep them from being infected by what ever sort of disease you might have. In my case, a common cold. I have a feeling, that "down wind" is going to play a big part in it. Just a thought. Will be interested in your opinion.