Final answer:
Louis Pasteur is not associated with the discovery of M. tuberculosis; that was the work of Robert Koch.
Step-by-step explanation:
Louis Pasteur, a prominent figure in microbiology and immunology, is not associated with the discovery of M. tuberculosis. Pasteur's significant contributions include disproving the theory of spontaneous generation, introducing the technique of pasteurization, and developing vaccines against diseases like anthrax and rabies. However, it was Robert Koch, another towering figure in the field of microbiology, who identified Mycobacterium tuberculosis as the bacteria responsible for tuberculosis.