Robert Koch - German scientist
Was the first scientist to prove that different germs caused mant common diseases.
In 1882 he discovered the bacteria which caused tuberculosis
Showed that it was possible to grow specific types of bacteria in a culture dish outside of the body, and then reproduce it in test animals.
Developed a way to stain different bacteria using coloured dyes which made it easier to single out and study each type of bacteria
Discovered cholera microbe
Made it easier for future scientists to study bacteria by growing them in a petri dish and using microscopes.