Louis Pasteur was one of the first scientists to discover the role of microorganisms in disease and how sickness could be prevented by vaccines. At the time, it was widely believed that ...

In an effort to save the silk-production industry, the French government persuaded Louis ... bacteria, respectively (and it was later shown that flacherie also has an important viral component ...

Enter: Louis Pasteur of France and Robert Koch ... err, well it just did, but because of bacteria in the air. Pasteur went on to argue that this same bacteria could cause disease.