A recent episode in Germany created a stir in the field of microbiology when microbiologist Dr. Stefan Lanka claimed he would award anyone 100,000 Euros who could prove the existence of the measles virus. At first it appeared he had lost. But Dr. Lanka took his loss to a higher court with more experts and the backing of two independent laboratories. He wound up not having to pay. It turned out that the “proof” provided was a composite of several different electron microscope images. And the composite involved different components of damaged cells. The composite could not be duplicated. The German Federal Supreme Court confirmed that there was not enough evidence to prove the existence of the measles virus. So how are they making MMR vaccines with attenuated measles viruses? In this article Paul Fassa looks at the history and controversy surrounding Louis Pasteur's germ theory and looks at other competing theories of disease of his time, and asks the question: Could there be something wrong with the Germ Theory?