One-step , real-time PCR assays for rhinovirus have been developed for a limited number of PCR amplification platforms and chemistries , and some exhibit cross-reactivity with genetically similar enteroviruses. We developed a one-step , real-time PCR assay for rhinovirus by using a sequence detection system (Applied Biosystems; Foster City , CA). The primers were designed to amplify a 120-base target in the noncoding region of picornavirus RNA , and a TaqMan (Applied Biosystems) degenerate probe was designed for the specific detection of rhinovirus amplicons. The PCR assay had no cross-reactivity with a panel of 76 nontarget nucleic acids , which included RNAs from 43 enterovirus strains. Excellent lower limits of detection relative to viral culture were observed for the PCR assay by using 38 of 40 rhinovirus reference strains representing different serotypes , which could reproducibly detect rhinovirus serotype 2 in viral transport medium containing 10 to 10,000 TCID 50 (50% tissue culture infectious dose endpoint) units/ml of the virus. However, for rhinovirus serotypes 59 and 69, the PCR assay was less sensitive than culture. Testing of 48 clinical specimens from children with cold-like illnesses for rhinovirus by the PCR and culture assays yielded detection rates of 16.7% and 6.3%, respectively. For a batch of 10 specimens, the entire assay was completed in 4.5 hours. This real-time PCR assay enables detection of many rhinovirus serotypes with the Applied Biosystems reagent-instrument platform. Rhinoviruses are the most common cause of viral upper respiratory tract infections and have been associated with more severe lower tract infections in compromised patients.1-3 Several real-time, RT-PCR assays have been developed; these have improved the diagnosis of rhinovirus infection over traditional culture methods, which are slow and insensitive. 4 -7 However, only a few published PCR assays have combined reverse transcription and PCR in the same real-time reaction (ie, one-step assay). 8,9 The advantages of the one-step assay over the two-step assay include improved workflow, reduction in assay preparation time, and elimination of cross contamination from the transfer of cDNA from the reverse transcription reaction into the PCR reaction. One-step assays have been developed for a limited number of PCR amplification platforms and chemistries and may not necessarily perform optimally with other platforms.8 In addition, cross-reactivity with genetically similar enteroviruses has been reported with some assays.
8,9A one-step, real-time PCR assay has not been described for the ABI Prism Sequence Detection System (Applied Biosystems; Foster City, CA) though this platform is widely used in clinical and research laboratories. High PCR efficiency with this platform generally requires the use of primers and a TaqMan probe (Applied Biosystems) with melting temperatures of 58°C to 60°C and 68°C to 70°C, respectively, and an amplicon size of 50 to 150 bp. The 5Ј noncoding region of the rhinovirus genome is most commonly targe...