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The present study was conducted on eight schools representing four different districts in Cairo Governorate from December 2006 till November 2007. The total annual number of school dust mites collected was relatively low (66 individuals). Shobera Al-khama schools embraced the highest population mite density (65.15%) followed by AlAbassia (16.16%), Al-Salam city (9.09%) and Nasr city recorded the lowest population density (7.58%). The most abundant family collected was Pyroglyphidae representing 27.27% of the total number distributed between two different species of the Genus Dermatophagoides (D.pteronyssinus and D. farinae). This followed by families Cheyletidae and Dermanyssidae, each comprises 25.75% of the total with a single species for each; Cheyletus malccensis and Dermanyssus sp., respectively. Family Acaridae was represented by (21.21% of the total) and came later in abundance. The average number /5 gm. dust ranged between only one individual during April and July and 20 individuals during November, however completely absent during March and September. dermanyssids and acarids were present in seven months, cheyletids in six months and pyroglyphids in five months. All mite species were recorded with relatively higher rate during cold months reaching its maximum in January for Pyroglyphidae and Acaridae and during October and November for Cheyletidae and Dermanyssidae. The lower rate of these mites obtained during hot months. These results indicate that the lower the temperature, the higher population density of school dust mites.

Study the quality of school environment as new habitat for allergenc mites in Cairo, Egypt