Who was the first scientist in 1865 to suggest that many diseases were caused by microorganisms?

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Louis Pasteur was the first scientist in 1865 to suggest that many diseases were caused by microorganisms. Thomas Young was a physicist and physician but did not make this specific discovery. Henry Graham was an American chemist who contributed to the understanding of acid-base equilibria. Robert Koch was a German physician who developed methods for isolating and identifying bacteria, but he did not make this specific discovery.

Who Was the First Scientist in 1865 to Suggest That