I think your wrong with your thinking there, mast cells are activated by mutiple stemuli includeing Lyme, bacteria's, toxins/chemicals, allergens and mutiple non-allergic stemuli, and infection does still play a role here, in water damaged building/home exposures it goes like this, the worse the WDB, exspecially high moisture/humidity wdb's, the worse the mast cell activation (other cells involved too), and theres a tipping point, even mast cells can only deal with so much and they well suppress the immune system to try to play catch up, not good ( and I always thought this was basicly where something goes wrong with how are mast cells behave, thus, very possabily the culprit in autoinflammatory,autoimmune disease, this tipping point basicly involves the switching to the th2 arm, and a allergic profile ( the allergy found in new ME/CFS patients that points to more severely damaged subjects). this tipping point is where things can go systemic, infection can accure, BBB can break down and for many in this case there is also a breakdown in the sinus/brain pathways, these exposures are chronic to acute exposures, it's on the more acute side that can push your body to the point of loss of tolerance and it's not just mutiple organs involved it's basicly the whole body, organs, systems and pathways. this has very little to do with genetics, and alot to do with maintaining homeostates. please excuse spelling errors.