A fraud conviction involving vaccine researcher Poul Thorsen is being used by vaccine-sceptic networks to revive claims that vaccines cause autism and to suggest that vaccine-safety research is deliberately manipulated. Social listening identified 1,186 related posts, with two distinct peaks around reports of the expected guilty plea and its subsequent confirmation. The narrative received renewed visibility after amplification by Joe Rogan and Vigilant Fox, whose post reached more than 409,000 views, and has circulated across 24 languages. While direct references to polio remain very limited, the case provides a new and credible-looking hook for the broader claim that scientific evidence supporting vaccine safety cannot be trusted.

Spain’s recommendations for vaccinating migrants and refugees are being presented as an admission that newcomers are importing diseases that had previously been eliminated, including polio. The narrative is risky because it combines vaccine misinformation with anti-migrant rhetoric, potentially undermining trust among host communities while discouraging migrants from accessing immunisation services.

Posts are connecting polio vaccination with Ebola through several overlapping claims: that Ebola originated from contamination during polio-vaccine production, that both diseases are fabricated explanations for poisoning or vaccine injury, and that polio, Ebola and COVID-19 form part of successive Western attempts to experiment on or reduce African populations. The narrative is risky because it links current outbreak concerns with long-standing distrust of polio vaccination and international health institutions. Although amplification remains fragmented, the connection could reinforce vaccine refusals and hostility towards outbreak-response activities in settings where communities already question the motives behind repeated vaccination campaigns.

Posts claim that autism now represents a larger childhood emergency than historic polio epidemics and portray vaccination as the likely cause. The narrative is risky because it reframes eradication as a harmful trade-off, suggesting that governments eliminated one disease while creating a more serious neurological condition. It may increase vaccine hesitancy while also stigmatising autistic people and their families.

A misleading numerical comparison claims that a child is substantially more likely to die following polio vaccination than from polio itself. The narrative is risky because it presents incompatible data as a simple and apparently objective calculation, potentially convincing caregivers that refusing vaccination is the rational and evidence-based choice. It also ignores that the current low incidence of polio in many countries is a consequence of sustained vaccination.

Posts use selected information from VAXELIS clinical-trial documentation to claim that a six-in-one childhood vaccine containing a poliovirus component killed six infants. The narrative is risky because it uses authentic regulatory documents while omitting the study context and investigators’ conclusions, making the allegation appear to be an admission hidden in official documentation.