Reason #456 why I'm glad I didn't join the military

My brother just told me he got the smallpox vaccination. Apparently in a few weeks a big blister is going to form on his shoulder and start oozing pus. He's been advised to stay away from small children since the pus is considered contagious. They also told him it would cause some irritation.

Well, no kidding?! A blister oozing contagious pus might cause some irritation. You don't say?