Brownstone Institute just published a long essay by Forrest Maready (August 23, 2026) arguing that the usual story of how polio paralysis happens is incomplete.
The standard model says poliovirus leaves the gut, rides the blood, and crosses the blood-brain barrier to hit motor neurons. Maready says that does a poor job of explaining why paralysis so often starts in children's legs, why motor (not sensory) neurons are hit, and why several other enteroviruses seemed to produce similar paralysis in the same era.
His alternative is a multi-hit picture: neurotoxic pesticides such as lead arsenate and DDT, plus a child's anatomy (gut and lower spinal cord sitting close together), could let virus reach motor neurons through lymphatics and nerves instead of a clean blood-to-brain route. He also notes historical overlap between heavy spraying and early epidemic clusters, and older medical writing on arsenical paralysis that looked a lot like poliomyelitis.
This is a hypothesis, not settled medical consensus. The piece is worth reading in full if you care about the history of public health and what counts as a single-cause story.
Source: https://brownstone.org/articles/rethinking-polio/
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