I have recently watched The Story of Louis Pasteur, a 1936 movie about, well, Louis Pasteur. I am not sure I recommend it artistically. It’s weirdly paced and its occasional gestures towards characterization only make it more obvious how much everyone in the story is a cardboard cutout. However, I have never seen a more effective altruist movie in my life.
Movie Review: The Story of Louis Pasteur
there's also Dr. Ehrlich's Magic Bullet from a few years later, another microbiologist movie