House dust mite infestation in Kindergartens of Hajiabad city

House dust mites have been shown to be strongly associated with allergic respiratory diseases such as, bronchial asthma and rhinitis in the world. The climatic conditions of Hajiabbad city which have subtropical climate provide a suitable place to proliferate house dust mites in public residential places. This study was conducted to determine the house dust mite infestation in Kindergartens of Hajiabad city. This was a cross-sectional study. Study populations were two Kindergartens which selected randomly in Hajabbad city. In each kindergarten dust samples were collected using vacuum clear. The samples were boiled and cleared in 85% lactic acid and the mites using an entomological needle were collected from the surface of suspension. Specimens were individually mounted on a microscope slide and identified to species by morphological criteria and using identification keys. In this study, in total 482 mites were collected and identified. They comprised of five species: Dermatophagoides farina (34.23%), D. pteronyssinus (27.18%), D. evansi (21.37%), Cheyletus malaccensis (12.24%) and, Ornithonyssus bacoti (4.98%). The most abundant species was D. farinae which collected from all of the kindergartens. Results of this study show that kindergartens in Hajiabbad are contaminated by more than one species of house dust mite. Respecting environmental health principles in kindergartens can play an important role in control of mite population and prevention of children respiratory diseases in this city.