Eighteen rRNA sequences of the main mite species isolated indoors were retrieved from the GenBank database and were aligned using BioEdit Software (Tom Hall Ibis Biosciences, California) to choose the most appropriate areas for primer design. Aligned sequences were those of D. pteronyssinus (accession numbers: EU152579; DQ025512; DQ025511), D. farinae (GQ864309; EU152578; GQ864309), Dermatophagoides evansi (EU152577), A. siro (AF022023; EU152495), L. destructor (EF203771), and T. putrescentiae (DQ025510). Primers and probes were designed using Primer Express® 3.0 for Real-Time PCR software (Applied Biosystems). Parameters used to design primers and probes were chosen to ensure optimal conditions for qPCR. Indeed, the minimum and maximum melting temperatures (Tm) permitted for primers were 58 and 60 °C respectively. The minimum and maximum percentages of C and G contained by either primer were 30 and 80% respectively, with a maximum of two residues on the 3′ end required to be a G or C. The optimal length allowed for each primer was 20 bases (9 bases minimum and 40 bases maximum). Minimum and maximum Tm allowed for probes were 68 and 80 °C respectively. The minimum and maximum percentages of G and C contained by the probes were 30 and 80% respectively for a length range of 13 to 30 bases. No more 3 G repeats were required in probe. The amplified region length permitted ranged from 50 to 150 bases.