I think it has to do with the TH1/TH2 balance in the immune system. Lyme has the ability to shift the balance one way or another, and a boost in one naturally suppresses the other. So if Lyme shifts someone's immune system balance towards TH2, then they'll have lower response to other infections and more response to allergens. If Lyme shifts someone's immune system balance towards TH1, then they'll have anergy to allergens and will over-respond to various infections and possibly also develop autoimmune conditions.
Chronic Lyme Disease, Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication Allergies & Intolerances, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD ("Secondary Lupus-Like Syndrome"), Osteoporosis, Anemia, Lymphopenia, intermittant Pancytopenia, chronic malabsorption/malnutrition, etc.; G Tube; Currently TPN-dependent.
Meds: Zofran, Pulmicort, Heparin (to flush PICC line), IV Cipro (for G-tube site infection).