ELISA (enzyme-linked immunosorbent assay) inhibition with a monoclonal antibody (mAb) (42B6) to Lepidoglyphus destructor was used to detect and quantify the storage-mite allergens in 30 dust samples collected from barns. Regarding the mite fauna, microscopic inspection of the barn dust and mite counts showed that L. destructor infested all 30 barns investigated (range 430-195 400 mites/g dust). In 29/30 barns, L. destructor constituted more than 70% of the Astigmata species. Acarus siro was found in 26 samples, the highest value being 16155 mites/g. No Dermatophagoides species were found. As to mites of the suborder of Prostigmata, species belonging to seven different families were detected. Besides the predominant L. destructor, allergens derived from other storage mites such as Glycyphagus domesticus, A. siro, and Tyrophagus putrescentiae have previously been assessed by this ELISA method. The correlation between number of mites and concentrations of mite antigen as measured by ELISA was assessed by linear regression (r2 = 0.83). Thus, inhibition of mAb 42B6 in ELISA would seem to offer a simple and reliable method to detect levels of dust-mite species belonging to the Acaridae and Glycyphagidae families.