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

  • Written by Jeffrey Morris, Professor of Public Health and Preventive Medicine, University of Pennsylvania
imageBiases 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At a Senate hearing on Sept. 9, 2025, on the corruption of science, witnesses presented an unpublished study that made a big assertion.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...

Read more: Why a study claiming vaccines cause chronic illness is severely flawed – a biostatistician...

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