Quote Originally Posted by davsel View Post
I thought vaccinations prevented me from contracting a disease I've come in contact with.
If i'm vaccinated, why do I care if other's are not?
My understanding (not a doctor nor did I stay in a Holiday Inn last night) is: Think of it more like a cup. You start at a regular 8 ounce cup. Someone gets sick near you, they start spreading the germs to those around them. You have 8 ounces of protection naturally, not a lot. Now, you go get vaccinated. Your cup is now a gallon jug, more protection. One person gets sick near you, you have enough protection to fend it off. However, if enough people around you still are using their 8oz, they get overwhelmed and start filling your cup as theirs overflows. You have protection, but as more and more around you get sick, eventually even your gallon jug will fill up.

Alternatively, think "fire resistant." Sure it'll resist fire up to a certain point, but if it gets hot enough long enough, even that will burn.