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African social media users are sharing threads about Hilary Koprowski’s 1950s oral polio vaccine trials in the Belgian Congo, describing them as “Africa’s most horrific vaccination experiment” and implying a connection to the HIV/AIDS pandemic. Although this hypothesis has been debunked, the narrative leverages historical colonial abuses to suggest presentday polio campaigns are unsafe or unethical. This can amplify distrust in vaccination efforts across the continent.

In a viral clip that's resurfaced on social media US Health Secretary, can be seen suggesting that the polio vaccine killed more people than it saved. Circulating clips claiming that millions were injected with SV40, a simian virus, via polio vaccines as part of a 75year bioweapon plan. They contend that SV40 causes cancer and that a coverup exists. Historically, between 1955–1963 some vaccines were inadvertently contaminated with SV40, but extensive studies have found no link between SV40 exposure and human cancers. SV40 has not been present in vaccines for decades, and vaccine production has long since adopted different cell lines and stringent quality checks.

A French TV clip of professor Didier Raoult stating that the polio strain detected in Gaza’s sewage is “a vaccine virus, not natural” has resurfaced, implying that authorities deliberately introduced a virus into the region. Social media users share the comment to fuel conspiracies that vaccines are bioweapons, especially in the context of the ongoing conflict. This misinterpretation can erode trust in emergency vaccination campaigns meant to stop the spread of vaccinederived poliovirus type 2 (cVDPV2).

Posts on X claim Jonas Salk’s vaccine was made from HeLa cells, implying that patients were injected with cancerous material. Influencers highlight the “dark truth” behind using Henrietta Lacks’ cells and insinuate that vaccines could cause cancer. In reality, HeLa cells were an invaluable research tool for developing polio vaccines; they are not an ingredient, and no evidence links polio vaccines to cancer.

A viral X/Twitter thread by Dr. Suzanne Humphries recasts the 1955 Cutter Incident—where one manufacturer’s tainted Salk vaccine caused thousands of polio cases—into a broader conspiracy. The thread asserts that multiple companies knowingly released live-virus vaccines and scapegoated Cutter because it lacked political influence. Instagram and Facebook reels amplify this by dramatising the government’s “rush” and showing children paralysed, implying that past errors mean today’s vaccines are unsafe. Experts note that the Cutter Incident was a tragic manufacturing lapse that spurred sweeping regulatory reforms and improved oversight.

A viral tweet alleges that doctors reclassified polio cases under names like GuillainBarré syndrome and acute flaccid myelitis, suggesting polio was never eradicated. This conspiracy claims that any neurological disorder is really polio and that vaccinedriven eradication is a fraud. Medical experts reject this: conditions such as GBS and AFM have distinct causes and existed before vaccines; they are not poliovirus infections. Global surveillance shows that wild poliovirus is now confined to Afghanistan and Pakistan, further disproving the claim.

Multilingual posts on Facebook and X are resurrecting the claim that poliomyelitis outbreaks were caused by pesticides like arsenic and DDT, not a virus. Advocates cite a book (Dissolving Illusions) and claim polio “disappeared” when spraying stopped, implying vaccines played no role. Spanish language threads and US influencers share old photos of crop spraying to bolster the theory. The narrative dismisses virological evidence of poliovirus and undermines the reason for immunization.

An Associated Press investigation into falsified vaccination records, unqualified vaccinators and rare vaccinederived poliovirus outbreaks in Pakistan and Afghanistan has been seized upon to argue that the oral polio vaccine (OPV) “doesn’t work.” Critics cherrypick phrases such as “imperfect vaccine” to suggest that vaccination is futile or dangerous. The AP report actually illustrates programme mismanagement in specific areas; cVDPV occurs only when immunization coverage is too low and the weakened virus circulates long enough to mutate.