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Boosted by the discovery of germ theory in the mid-1800s, these departments prevented disease through large-scale projects.

Kennedy has spent two decades diving so far down the conspiracy theory rabbit hole that he now sounds like he doubts even basic germ theory.

For a man who claims it's time for a "break" in medical research into infectious disease, it was likely an irritating irony to present such a compelling reminder of the validity of germ theory.

Second, Louis Pasteur advanced the germ theory of disease, which postulated that microbes can cause illness.

He doesn't entirely believe in germ theory, suggesting that a "healthy" human body cannot be damaged by microbes.