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Jeffrey S. Morris, Professor of Public Health and Preventive Medicine, University of Pennsylvania

Why a study claiming vaccines cause chronic illness is severely flawed – a biostatistician explains the biases and unsupported conclusions

Biases in designing a study can weaken how well the evidence supports the conclusion. FatCamera/E+ via Getty Images

At a Senate hearing on Sept. 9, 2025, on the corruption of science, witnesses presented an unpublished study that made a big assertion.

They claimed that the study, soon to be featured in a highly publicized film called “An Inconvenient Study,” expected out in early October 2025, provides landmark evidence that vaccines raise the risk of chronic diseases in childhood.

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