http://www.immune.org.nz/vaccines/efficiency-effectiveness There is science around how long they ask. I'm surprised you have been quite so ready to leap to "no science" as an option. Yes it is a statistics game and again we know the numbers and know what levels are required to maintain a herd immunity, which helps people like yourself by making the spread of the contagion much more difficult. This is pretty basic stuff, we know it works, we have proven it and we prove it time and time again.

I appreciate that things are odd in the USA due to the way medicine and health has been commercialised, but trust me it is dirt cheap in Europe and we have none of the problems you allude to.