Joe Rogan on polio: what the evidence says · JRE #2454

What the evidence says 01 / RECORD

Rogan asserted that 95 to 99% of poliovirus infections are asymptomatic and suggested, citing Suzanne Humphries's work, that historical DDT spraying rather than poliovirus explained cases of paralytic polio. The asymptomatic-infection figure overstates the published range: CDC's Yellow Book states most poliovirus infections are asymptomatic, with about 25% causing minor illness and paralysis occurring in roughly 1 in 200 to 1 in 2,000 infections, while an NIH-published review states infection is asymptomatic in 75% to 90% of cases. Both cited sources put the asymptomatic share below Rogan's 95 to 99% figure, though the general point that most infections cause no symptoms is directionally correct. The claim that DDT exposure, rather than poliovirus, caused historical paralytic polio cases is not supported. A FactCheck.org review found no evidence that DDT causes polio or that ending its use ended the disease: DDT use in the United States peaked in 1959, after polio incidence had already begun its sharp decline following the 1955 rollout of the Salk vaccine, and no dose-response or geographic correlation between DDT application and polio outbreaks has been established. Paralytic polio is instead explained by poliovirus's mechanism of invading the central nervous system and destroying motor neurons in the spinal cord and brainstem, a pathology distinct from pesticide toxicity. The claim combines an exaggerated but directionally accurate virological statistic with a fringe causal theory that the cited evidence does not support.