Abstract
Asthma and allergic rhinitis affect 15% and 38% of South African children respectively; house dust mite (HDM) is the most significant aero-allergen involved. The HDM species involved include Dermatophagoides pteronyssinus, Dermatophagoides farinae and Blomia tropicalis. Conventional skin prick tests only for Dermatophagoides and not Blomia tropicalis due to cross-reactivity between the Dermatophagoides species that isn't shared by Blomia. Blomia tropicalis has only been described in the tropical and subtropical regions of the world.
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