Senator Sanders Challenges RFK Jr. on Germ Theory Rejection in Senate Hearing

During a Senate hearing on Wednesday, Senator Bernie Sanders (I-Vt.) directly challenged Robert F. Kennedy Jr.—the anti-vaccine activist serving as Health Secretary—on his rejection of germ theory, the foundational scientific principle that specific pathogenic microbes cause specific diseases.

After Kennedy defended his fringe views, Senator Bill Cassidy (R-La.) intervened to fact-check and debunk Kennedy’s denialist arguments in real time.

This exchange marked a rare instance in which Kennedy’s dismissal of germ theory was addressed in a high-profile public forum, specifically during a hearing of the Senate Committee on Health, Education, Labor, and Pensions.

Kennedy’s Germ Theory Denial: A History of Controversy

Kennedy, who lacks a background in science, medicine, or public health, is widely recognized as a prominent anti-vaccine activist and promoter of conspiracy theories. However, his outright rejection of a cornerstone of biomedical science has largely gone underreported until now.

As reported by Ars Technica in 2023, Kennedy explicitly outlined his germ theory denialism in his 2021 book, The Real Anthony Fauci. In the book, Kennedy portrays germ theory as a tool used by pharmaceutical companies, scientists, and doctors to push modern medicines. Instead of accepting germ theory, Kennedy advocates for a concept resembling the long-discarded terrain theory—the idea that diseases arise from imbalances in the body’s internal “terrain,” allegedly caused by poor nutrition and exposure to environmental toxins.

Kennedy incorrectly labels this as “miasma theory” in his book, a misnomer since miasma theory suggests diseases stem from breathing foul air or vapors from decaying matter—a theory already replaced by germ theory. Meanwhile, terrain theory was never widely accepted in the scientific community.

Senate Hearing Highlights Kennedy’s Scientific Claims Under Scrutiny

The Senate hearing provided a rare platform for Kennedy’s fringe views to be publicly challenged. Senator Sanders’ direct confrontation and Senator Cassidy’s real-time fact-checking underscored the gravity of Kennedy’s claims and their potential impact on public health policy.