Watch Dr. Lee Merritt’s powerful discussion exploring how early 20th-century researchers viewed the origins of disease—and how those ideas were replaced in the decades that followed.

She traces the forgotten parasite theory from 1909, examines how post–World War II programs reshaped medical research, and reveals why many conventional treatments have failed to deliver.
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Dr. Merritt also shares her insights on how vaccine manufacturing practices intersect with modern health outcomes.