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. 1999 Oct 26;147(6):353–361. doi: 10.1016/S0923-2516(97)85127-8

Evaluation of reverse transcription and polymerase chain reaction (RT/PCR) for the detection of rota viruses: applications of the assay

Évaluation de la RT/PCR pour 1a détection des rotavirus: applications de cette technique

J Buesa 1,*, J Colomina 1, J Raga 1, A Villanueva 1, J Prat 2
PMCID: PMC7134719  PMID: 8958588

Summary

Our aim was to evaluate the reverse transcription and polymerase chain reaction (RT/PCR) technique for the detection of rotavirus shedding by infected children as a routine diagnostic procedure, in comparison to the enzyme-linked immunosorbent assay (ELISA), electron microscopy (EM) and polyacrylamide gel etectrophoresis (PAGE) of rotavirus double stranded RNA.

Two-hundred and twenty stool specimens were collected from infants and young children with diarrhoea, and 10–20% faecal suspensions were made. Several methods of rotavirus dsRNA extraction were assayed. Electrophoretic analysis of viral RNA was carried out on 10% polyacrylamide gols followed by silver staining. RT/PCR was performed using oligonucleotide primers specific for both 3′ and 5′ ends of the rotavirus gene encoding VP7 which ere highly conserved among group A rotaviruses.

Following RNA extraction with phenol-chloroform and ethanol precipitation, RT/PCR could detect rotaviral RNA in only 11 of 25 samples known to contain rotaviruses by conventional methods. The purification of RNA extracts by CF11 cellulose and the application of the RNAID method were equally effective in extracting RNA and/or removing inhibitory substances from the faecal samples. RT/PCR led to the detection of 66 positive samples from 220 specimens tested (30%). whilst 64 specimens were positive by EUSA (29%), 59 (26.3%) by PAGE and 56 (25.4%) by EM. In our study, RT/PCR was 100 times more sensitive than the ELISA test in detecting rotaviruses serially diluted in a faecal suspension. Although RT/PCR is theoretically much more sensitive than ELISA, PAGE and EM for detection of rotaviruses, great care must be taken to remove inhibitory substances from the enzymatic reactions. We do not consider that RT/PCR should replace immunoassays with high sensitivity and specificity for rotavirus testing in faecal samples, although this technique has other applications, like the search for rotavirus in different clinical specimens (sera, cerebrospinal fluid, respiratory secretions, etc.) and in environmental samples, as well as the typing of viral strains using serotype-specific primers.

Key-words: Rotavirus RT/PCR, ELISA, PAGE, Electron microscopy, Viral analysis, Sensitivity

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