Perhaps someone here is more versed in the field and can help me understand something... It seems like the "parasite" theory is a more specific example of the

Perhaps someone here is more versed in the field and can help me understand something... It seems like the "parasite" theory is a more specific example of the "fast reaction to toxins" theory being presented. Are there bigger differences that I'm not understanding, or is the resistance to the idea just that the new theory is overgeneralizing?