He believed that yellow fever was caused by spirochaete bacteria instead of a virus, and spent much of the next ten years attempting to prove this theory.
He worked for much of the next ten years trying to prove this theory. He believed that yellow fever was caused by spirochaete bacteria instead of a virus.
He believed that yellow fever was caused by spirochaete bacteria instead of a virus. He worked for much of the next ten years trying to prove this theory.
He believed that yellow fever was caused by spirochaete bacteria instead of a virus. He worked for much of the next ten years trying to prove this theory.