For those with experience of programming, below is simple pseudo code (with scientific dictate) to find out if a virus causes disease.
if (Belief(a virus causes new disease))
TakeSputumEtcSampleFromPeople(with similar illness);
virus = CharacteriseExogenousOnlyPurified(a virus);
if ExposeWellSubjectsTo(virus) != SameIllness
Belief(a virus causes the new disease) = false;
The longer English language version, signed by a couple of medical professionals and supported by over 9000 people around the world, is here.