That beard and mustache probably filters out all the nasty germs. :-)
It didn't work for a decade in DC. My worst bug was some bronchitis I
had the whole time I was in FT "A" school. Lots of us had it. In
retrospect I wonder if it was something in those nasty "temporary"
WWII barracks.
I've had bronchitis twice and both times were within days after getting
off of a plane.