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Generation, Amplification, and Titration of Recombinant Respiratory Syncytial Viruses
Published on: April 4, 2019
One-step reverse transcriptase polymerase chain reaction for the diagnosis of respiratory syncytial virus in children
Cesar Augusto do Nascimento1, Andréa Lima Leal, Thereza Silva Souza
1Butantan Institute, Virology Branch, Av. Vital Brazil 1500, Butantã 05503-900, Brazil.
Insights
A new one-step reverse transcriptase PCR (RT-PCR) offers rapid, sensitive, and specific detection of Human Respiratory Syncytial Virus (HRSV) in children. This method simplifies diagnosis and reduces contamination risks compared to traditional techniques.
Area of Science:
- Virology
- Molecular Diagnostics
- Pediatric Infectious Diseases
Background:
- Human Respiratory Syncytial Virus (HRSV) is a primary cause of severe respiratory infections in young children.
- Accurate and swift diagnosis of HRSV is crucial for effective patient management and to prevent unnecessary antibiotic prescriptions.
- Established diagnostic methods like indirect immunofluorescence assay (IFA) and reverse transcriptase PCR (RT-PCR) offer high sensitivity and specificity.
Purpose of the Study:
- To develop and evaluate a simplified, single-tube, one-step RT-PCR assay for HRSV detection in clinical samples.
- To compare the performance of the one-step RT-PCR with conventional IFA and semi-nested RT-PCR methods.
- To enhance the ease of use and minimize cross-contamination risks associated with multi-step diagnostic procedures.
Main Methods:
- Development of a one-step RT-PCR assay for HRSV detection.
- Testing of nasopharyngeal aspirates from 226 pediatric patients using IFA, one-step RT-PCR, and semi-nested RT-PCR.
- Comparative analysis of diagnostic accuracy, speed, and usability across the three methods.
Main Results:
- The one-step RT-PCR detected HRSV in 40.7% of samples, IFA in 37.2%, and semi-nested RT-PCR in 42.5%.
- A total of 45.1% of samples tested positive by at least one method, with 33.2% positive across all three.
- One-step RT-PCR demonstrated speed and specificity, avoiding false positives linked to semi-nested PCR.
Conclusions:
- The developed one-step RT-PCR is a fast, sensitive, and specific diagnostic tool for HRSV.
- This simplified method reduces the risk of sample cross-contamination and procedural errors.
- Combining one-step RT-PCR with other methods can further improve overall HRSV detection rates.
Abstract:
Human respiratory syncytial virus (HRSV) is the main cause of acute lower respiratory tract infections in infants and children. Rapid diagnosis is required to permit appropriate care and treatment and to avoid unnecessary antibiotic use. Reverse transcriptase (RT-PCR) and indirect immunofluorescence assay (IFA) methods have been considered important tools for virus detection due to their high sensitivity and specificity. In order to maximize use-simplicity and minimize the risk of sample cross-contamination inherent in two-step techniques, a RT-PCR method using only a single tube to detect HRSV in clinical samples was developed. Nasopharyngeal aspirates from 226 patients with acute respiratory illness, ranging from infants to 5 years old, were collected at the University Hospital of the University of Sao Paulo (HU-USP), and tested using IFA, one-step RT-PCR, and semi-nested RT-PCR. One hundred and two (45.1%) samples were positive by at least one of the three methods, and 75 (33.2%) were positive by all methods: 92 (40.7%) were positive by one-step RT-PCR, 84 (37.2%) by IFA, and 96 (42.5%) by the semi-nested RT-PCR technique. One-step RT-PCR was shown to be fast, sensitive, and specific for RSV diagnosis, without the added inconvenience and risk of false positive results associated with semi-nested PCR. The combined use of these two methods enhances HRSV detection.
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