Will Falconer, DVM Moderator
Low traffic? Why? You want exposure, Cassi, and I'm not sure you'll get it where you describe. Look for high traffic, ruffian overrun parks. The protocol is right, but if they're all vaccinated, you'll not likely find any wild viruses there. Maybe some oddball modified ones, if someone is shedding their vaccine viruses.
Adenovirus? Meh. Not an issue. Nobody dying of that, certainly, unless they've got serious health compromises.
No, to your last question. Every vaccine entering the body is a risky proposition. Probably more so in someone whose immune system was assaulted earlier.
Reread the blog post about natural exposure and see where these pups went and the fantastic immunity they received as a result.
As you gain confidence, your fear around this will fall away. The "boy in the bubble" was an anomaly. If you want a stout immune system, you've got to exercise it! Search on "Amish" in the search box and read about their amazing exposure as babies onwards and their lack of asthma.