While this won't solve all concerns, my friends who recently had a baby posted a notice on FB that everyone who wanted to visit and see the new baby HAD to be up-to-date on all vaccinations, including the flu shot. Here's what they said:

As a mom of someone who has Autism this pisses me off. If my child was sending crap like this, he would face my WRATH and would not be given access to the internet till he could act correctly. Also Autism doesn't cause you to do crap like this, being a dick does.