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A qualitative multiplex reverse transcription (RT)-PCR and liquid hybridization assay for the detection of human enteroviruses, rhinoviruses, parechoviruses, and Aichi virus was developed. Furthermore, a separate assay for the recognition of hepatitis A virus was established to complement the test pattern so that all human picornaviruses were covered. The amplicons, which represented the 5' untranslated regions of the viral RNA genomes, were identified in liquid hybridization reactions with genus-specific digoxigenin-labeled oligonucleotide probes. The sensitivity of the multiplex RT-PCR and liquid hybridization assay was 10 to 100 picornavirus genome equivalents for representatives of each picornavirus genus. The hepatitis A virus assay exhibited a sensitivity of 10 genome copies. Both the uniplex and the multiplex tests were highly specific for the target viruses. Twenty-three clinical samples, including cerebrospinal fluid, serum, and nasopharyngeal swab specimens, were used for clinical evaluation of the multiplex RT-PCR assay. The results obtained were consistent with the results of routine virus diagnostic assays. Furthermore, the assay was used to screen 68 stool specimens for the presence of parechoviruses and Aichi virus. One sample was found to contain parechovirus RNA, whereas no Aichi virus was detected. The assay described here can be applied for the efficient identification of human enteroviruses and rhinoviruses in clinical specimens and simultaneously enables the collection of information on the epidemiology and clinical outcomes of infections caused by the currently poorly known human parechoviruses and Aichi virus.

Detection of Human Picornaviruses by Multiplex Reverse Transcription-PCR and Liquid Hybridization