There was a similar debate in the 1880s. Dr. Robert Koch claimed some diseases were caused by bacteria and developed a procedure to prove it. The germ theory of

There was a similar debate in the 1880s. Dr. Robert Koch claimed some diseases were caused by bacteria and developed a procedure to prove it. The germ theory of disease was controversial until then. Its suspected several diseases without known causes may be caused by a bacterium, virus or protein. But lack the evidence to satisfy the Koch postulates. These diseases include some cancers and many human nervous system diseases.