On a side note, as a kid in the 50's I had all the vaccines. And I still had whooping cough, chicken pox and German measles.
The year mattered only in the respect that it was written with specific objections to Perry’s method of mandate that would (could) be irrelevant if implemented differently by a future Texas legislature.
But I guess we disagree on the opt-out. I’ve seen it work.
(My whole family got whooping cough last year.)
I had the German measles vaccination as a kid but after our first child was stillborn they checked and found that I was not immune to German measles. I had to get another vaccination before we could try to conceive again.