The claim: New study proves Pfizer COVID-19 vaccine causes cancer
An Aug. 20 Instagram post (direct link, archive link) shows two dissected mice with their inner organs exposed.
“SHOCKING: New Study proves Pfizer mRNA induced turbo cancer,” the post reads.
The post received more than 1,000 likes in nine days. A similar post shared on X, formerly Twitter, in July was reshared more than 10,000 times.
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Our rating: False
There is no evidence that COVID-19 vaccines cause cancer. The post distorts a case report focused on a mouse that died of lymphoma after it was given a second dose of the Pfizer COVID-19 vaccine during a study. The report did not claim the two events were causally linked.
Report finds evidence of causality 'lacking'
The Instagram post references a case report published in Frontiers in Oncology in May that examined a study involving 14 mice injected with the Pfizer COVID-19 vaccine. The case report focused on one mouse in the study that died of lymphoma, a cancer of the lymphatic system, two days after receiving its second dose of the vaccine.
But the report does not assert this event "proves" the mouse developed cancer because of the vaccine, as the Instagram post claims.
In fact, the report states evidence to make such a determination is "lacking" and that a causal link between the two events "cannot be unequivocally established and may represent coincidence."
There...
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