I recently came across this piece by the LA Times. Frankly, I'm scared. Epidemiology may not be my field, but this is far, far worse than I'd imagined.
The mathematics of mass vaccination are complicated, and the level of vaccination required to achieve herd immunity varies between illnesses (or even strains of the same illness), but I can't think of any illness where a vaccination rate of 13.5% is enough to provide such an effect. That is, admittedly, the most extreme example on the list, but I could say the same of a vaccination rate of 50%, which is much more common. Generally speaking, a vaccination rate of anywhere from 85% to 95% is required for herd immunity to provide any real protection.
They might have well posted this data as an article, and labelled it, "California kindergatens are fertile breeding grounds for some of the nastiest diseases circulating in the world today!"
I'm beginning to suspect that it'll take a genuine tragedy to stop Jenny and her brand of idiots. In the meantime, her kill count keeps rising... and, for every additional unvaccinated child, the scope of the inevitable tragedy, when it comes, grows.
As I said, I'm pretty thoroughly scared by this.