Analyzing subjects with allergic rhinitis and/or asthma with SPT to HDM and storage mites (SM) –including Blomia tropicalis- 82% had SPT positivity to HDM and% to SM, but only 1.5% of the patients were sensitized to SM without HDM sensitization, as judged by SPT, and 14% according to specific IgE [29]. This evidence concerns the gene IGHE and asthma.