Causes an allergic reaction in human. Binds to IgE of patients allergic to storage mite T.putrescentiae (PubMed:9492316, PubMed:20197679, PubMed:20683648). Binds to IgE in 53% of the 44 elderly patients (aged 70-90) tested (PubMed:20197679). Binds to IgE in 73% of the 22 young adult rhinitis patients tested allergic to mites (both T.putrescentiae and D.pteronyssinus) (PubMed:20683648). Common symptoms of mite allergy are bronchial asthma, allergic rhinitis and conjunctivitis (Probable). Belongs to the NPC2 family.