Vaccination & epidemic

[Undertoad]

OK let's use an example.

In an avalanche, the cause is the slow buildup of unstable snow on a height, and the trigger is a relatively small event - the falling of a branch, the schuss of a skier - that finally brings all that instability to bear, and the event happens.

It is you who has consistently denied the possibility

That wasn't what we were talking about, but fine. I don't deny anything. I merely ask for proof of a causal relationship. I don't deny, I challenge. They are different. I can give you more examples if you require.