Allergenic Dermatophagoides mites causing asthma among schoolchildren at Ain-Shams District,Cairo,Egypt.

The present study was performed on house dust samples collected from ten homes of schoolchildren suffering from asthma at ain-shams district,over a period of two years (2008 & 2009). the data revealed that the total annual density of the two allergenic mites (dermatophagoides pteronyssinus (trouessart) & dermatophagoides farinae (hughes) was 202 individual mites with 22 asthmatic children in the first year,and individual mites increased to 268 with 36 asthmatic children in the second year. the two house dust mites were more abundant in bedrooms than in living ones (292 & 187 mites,respectively). the prevalence of the house dust mites on the mattresses and furniture were higher in bedrooms and living rooms than on the floors (340 & 140 mite,respectively). winter season recorded the highest prevalence for both mites in the first and second year (87 & 110,respectively). summer represented the lowest values (19 & 25,respectively).