We have had chickens for almost 2 yrs now and have worked outside building things for them all the time & cleaning coops.....
Its usually, cut a piece of wood, hold a chicken, put in a couple screws, stop to pet a chicken, back to cutting wood, stop to take a cracker/snack one of the kids brought out to share, clean coop, throw down new straw, let chickens back into the coop, plop down into the new straw and get climbed on...etc etc. I know for a fact that if we ran inside every 2 minutes to wash our hands, we would never get anything done! Noone here has ever 'gotten' anything from our chicks/chickens, but a few scratches and lots of snuggles
The kids bring all their cold germs home from school!!! Tell hubby to quit worrying so much! We hug and kiss our chickens all the time (well just the extra cute, cuddly ones) and life is good.
Bet if you took a poll, the germaphobes probably get sick more often than the rest of us.