Mite and Cockroach Sensitisation in Patients with Allergic Rhinitis in the Free State (Original Articles)
Allergen sensitivities of patients with allergic rhinitis in the Free State have been described, (1,2) with sensitisation patterns being similar in asthmatic patients. (3) These studies showed a high prevalence of grass pollen sensitisation and a lower level of house-dust mite sensitisation than in the coastal areas, where between 65% and 95% of atopic patients are sensitised to house-dust mites. (4-7) Despite there being a large farming population, there was a low prevalence of sensitisation to the storage mite Lepidoglypghus destructor. (1) No studies have been performed on sensitisation to the other storage mites or to spider mites in the Free State. The prevalence of cockroach sensitisation in atopic patients in various parts of southern Africa is similar to that in Europe, the USA and Asia. (7-9) Although sensitisation to Blatella germanica has been found in patients from coastal and inland areas of southern Africa, (8,9) Periplanata americana and Blatta orientalis elicit the strongest IgE responses in Cape Town and Durban, while B. germanica sensitisation predominates in Pretoria and Harare. (8) There are no published studies on cockroach allergy in the Free State.