> All causal connections are either 100% and any fuzziness just means we're missing information about other joint causal events that must occur to trigger the o

> All causal connections are either 100% and any fuzziness just means we're missing information about other joint causal events that must occur to trigger the outcome. I think one theory is, that the immune system has a way of approximating the surface of a protein, and in this way recognizes what to build antibodies against. This process could be a source of fuzziness as the "protein signatures" of a virus may vary from person to person. There is also the question how those signatures are stored and retrieved in the immune system, and why they -presumably- lead to the immune system misrecognizing myelin sheaths as a threat (in some people, some of the time.)