Infectious Disease and IQ

An argument that infectious disease correlates with IQ...regionally speaking.

More infectious disease in a region, lower IQ.  That makes them inversely related.  Look at me, I can sound sciencey.

I do wonder about the causal relationship.  Is it infectious disease generally, or is it specifically in the teachers?

I assume it's the latter, else it wouldn't be something we could fix by breaking the union, or creating more cultural training, or revamping the teacher evaluation system.

Okay, seriously, the author uses his theory to weigh in against the 'genetics causes IQ variation' argument.  Along the way, of course, the claim also adds weight to the idea that situational factors can matter in educational outcomes.