Abstract:
:Quantitative real-time PCR for the detection of respiratory syncytial virus (RSV) RNA is increasingly used to study the causal role of RSV in lower airway disease. The objective of our study was to evaluate variations in RSV RNA loads at different steps in the RNA quantification process: (i) variation in RSV RNA load within one sample (step 1), (ii) variation in the load in samples from patients who were sampled twice on the same day (step 2), and (iii) variation in the load between simultaneously taken nasopharyngeal aspirate (NPA) samples and tracheal aspirate (TA) samples (step 3). Thirty-two infants with RSV infection at the pediatric intensive care unit (PICU) were included. NPA and TA samples were taken three times a week during ventilation and were not diluted. Intrasample variation (step 1) was shown to be minimal (<0.5 log(10) particles/ml). Intraday variation (step 2) was the lowest for samples with high viral loads (95% limits of agreement, -1.3 to +0.9 log(10)), whereas it increased for samples with relatively lower viral loads (viral load, <6.0 log(10) particles/ml; n = 138 sample pairs from 20 patients). RSV loads in NPA and TA samples (step 3) were found to be the most comparable during the early phase of infection (95% limits of agreement, -1.5 to +1.4 log(10)). The variation increased during the late phase of infection (i.e., in follow-up samples), with the loads in NPA samples remaining significantly higher than the loads in TA samples (n = 138 sample pairs from 31 patients). In conclusion, quantitative detection of RSV RNA in undiluted mucus is a reliable method to quantify viral loads. Nasopharyngeal aspirate samples collected in the initial phase of infection can be used to predict RSV RNA loads in the lower airways.
journal_name
J Clin Microbioljournal_title
Journal of clinical microbiologyauthors
van de Pol AC,Wolfs TF,van Loon AM,Tacke CE,Viveen MC,Jansen NJ,Kimpen JL,Rossen JW,Coenjaerts FEdoi
10.1128/JCM.00097-10subject
Has Abstractpub_date
2010-10-01 00:00:00pages
3569-74issue
10eissn
0095-1137issn
1098-660Xpii
JCM.00097-10journal_volume
48pub_type
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journal_title:Journal of clinical microbiology
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journal_title:Journal of clinical microbiology
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journal_title:Journal of clinical microbiology
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journal_title:Journal of clinical microbiology
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journal_title:Journal of clinical microbiology
pub_type: 临床试验,杂志文章
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journal_title:Journal of clinical microbiology
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journal_title:Journal of clinical microbiology
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journal_title:Journal of clinical microbiology
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.34.4.973-974.1996
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journal_title:Journal of clinical microbiology
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journal_title:Journal of clinical microbiology
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doi:
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journal_title:Journal of clinical microbiology
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更新日期:2007-05-01 00:00:00
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.18.6.1345-1350.1983
更新日期:1983-12-01 00:00:00
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journal_title:Journal of clinical microbiology
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