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Updated: Jan 7, 2026
Detection and Genogrouping of Noroviruses from Children's Stools By Taqman One-step RT-PCR
Published on: July 22, 2012
Development and Validation of a Commercial TaqMan-Based RT-qPCR Kit for Rotavirus and Norovirus Detection in the
Geison Cambri1, Thiago Jacomasso1, Fernanda Marcicano Burlandy2
1Molecular Biology Institute of Paraná (IBMP), Curitiba 81350-010, PR, Brazil.
Insights
A new multiplex assay accurately detects rotavirus A (RVA) and norovirus, key causes of acute gastroenteritis (AGE) in children. This rapid diagnostic tool enhances surveillance and public health response in Brazil.
Area of Science:
- Virology
- Molecular Diagnostics
- Public Health
Background:
- Acute gastroenteritis (AGE) is a significant global health concern, particularly for children under five in low- and middle-income countries.
- Rotavirus A (RVA) and norovirus are the primary viral pathogens responsible for AGE, necessitating effective diagnostic tools for surveillance and control.
Purpose of the Study:
- To develop and validate a commercial multiplex TaqMan-based RT-qPCR assay for the simultaneous detection of RVA and norovirus (GI and GII) in Brazil.
- To enhance molecular diagnostic capabilities for improved public health surveillance and response to AGE outbreaks.
Main Methods:
- Assay development involved optimizing primers and probes for multiplex RT-qPCR, followed by rigorous analytical validation of sensitivity and specificity.
- A multicenter pilot study was conducted across Brazil's AGE surveillance network to evaluate the assay's real-world performance.
- Validation included testing clinical samples, assessing reproducibility, and evaluating stability under various conditions.
Main Results:
- The IBMP NAT assay demonstrated high diagnostic sensitivity (>96%) and specificity for RVA and norovirus (GI/GII) detection, with no observed cross-reactivity.
- Low Limit of Detection (LoD95) values (18.6 GI, 71.2 GII, 12.3 RVA copies/reaction) and strong reproducibility were confirmed.
- The assay showed improved detection of low viral loads compared to in-house RT-qPCR methods and maintained consistent performance across stability tests.
Conclusions:
- The IBMP NAT Kit provides a rapid, sensitive, and reliable molecular diagnostic solution for detecting RVA and norovirus in fecal specimens.
- This assay significantly strengthens public health surveillance infrastructure in Brazil, enabling timely responses to AGE outbreaks.
- The improved diagnostic capability aids in reducing the disease burden associated with viral gastroenteritis in vulnerable pediatric populations.
Abstract:
Acute gastroenteritis (AGE) is a major cause of illness and death in children under five, especially in low- and middle-income countries, and rotavirus A (RVA) and norovirus are the leading viral agents. The present study aimed to describe the development of a commercial multiplex TaqMan-based RT-qPCR assay to detect those viruses to enhance surveillance and public health responses in Brazil. The assay validation involved optimizing primers and probes for multiplex RT-qPCR, assessing analytical sensitivity, and confirming specificity. A multicenter pilot study across Brazil's AGE surveillance network assessed the assay's performance. The IBMP NAT assay demonstrated high specificity and sensitivity for detecting RVA and norovirus GI and GII. No cross-reactivity was observed. LoD95 values were low: 18.6 (GI), 71.2 (GII), and 12.3 (RVA) copies/reaction. In 379 clinical samples, diagnostic sensitivity and specificity exceeded 96% for all targets. The assay showed strong reproducibility across operators and instruments. Stability tests confirmed consistent performance under freeze-thaw, transport, and storage conditions. Compared to in-house RT-qPCR, the IBMP NAT test yielded lower Ct values, indicating improved detection of low viral loads. The IBMP NAT Kit significantly advances molecular diagnostics, enabling rapid, sensitive, and reliable detection of RVA and norovirus in fecal specimens. It strengthens public health surveillance and supports timely responses to AGE outbreaks, helping reduce disease burden in vulnerable populations.
