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The incidence of 'climate asthma' in South Africa: its relation to the distribution of mites
Abstract
A survey has been made of rhe regions of South Africa, from rhe low coasral alrirude to the inland regions of high altitude, in regard to the presence and number of mires in the house dust in connection with 'climate asthma'. The data obtained confirm that the nl/mber of mires in rhe house dust depends upon the relative humidiry of the region involved. A number of anomalous findings are reported from inland and coastal regions where unexpectedly high or low mire counts are recorded. They are accounted for, however, by the high or low relative humidiry of the area concerned due to the local adjoining warm or cold ocean-currents. This confirms the relationship of rhe incidence of 'climate asthma' to the factor of relarive humidity. The mite most commonly found in the house dusts in South Africa is Dermatophagoides pteronyssinus. Other mites found include Euroglyphus maynei, Chortoglyphus domesticus and orher species. Dermatophagoides farinae mites were recovered in scanty numbers from the house dust of only 2 towns.
