Where's the proof?

There is no proof, there is a consensus among epidemiologist of occidental medicine. For exemple, traditional chinese medicine does not recognize virus as cause of diseases. Now, if the consensus is right, taking actions could save lifes. Promoting a better health through a better nutritution, some QiCong exercices is also saving lifes. Each patient is responsible for which medicine he is choosing.
What would be a proof ? How much time would be necessary to get a proof ? What to do expecting the results of the experiments ?