I wish I could find a nice way to say "If you're sick, please don't come for drinks" or "If you're sick, please don't hug me" or "If you're sick, please don't invite me into your home". I'd even be happy to have a nice way of asking if someone who sounds snuffly has a cold or if it's just allergies.
Most of the general public don't realize that as a side effect of MS, their sniffles could trigger my next relapse. Even if I don't get relapse from a cold, I'm nearly guaranteed a pseudoexacerbation (kind of like a temporary relapse).
Get your flu shots, people. It protects you and it also helps protect people like me!