No they tend to bite the face and mouth areas to suck blood. My guess is that since blood is closer to the skin in the head, it’s easier for them to get to.
Yes, but it’s the poop with the parasite that gets you:
http://www.themonitor.com/articles/mcallen-55912-potentially-bugs.html
From the article:
The kissing bug is a blood feeder that typically lives near livestock. When it eats, it immediately defecates, and the parasite is found within its feces.