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Genetic characterization of human respiratory syncytial virus detected in hospitalized children in the Philippines from 2008 to 2012.
- Source :
-
Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology [J Clin Virol] 2013 May; Vol. 57 (1), pp. 59-65. Date of Electronic Publication: 2013 Jan 26. - Publication Year :
- 2013
-
Abstract
- Background: Human respiratory syncytial virus (HRSV) is the leading cause of acute lower respiratory tract infection in infants and young children. However, molecular characteristic of HRSV is still unknown in the Philippines.<br />Objective: To describe the molecular epidemiology of circulating HRSV detected in the Philippines.<br />Study Design: From May 2008 to April 2012, nasopharyngeal swabs were collected from infants and children aged between 7 days and 14 years who were hospitalized with severe pneumonia. HRSV was detected by nested PCR targeting M2 gene, and C-terminus of the G gene was sequenced for phylogenetic analysis.<br />Result: Out of total 2150 samples, 19.3% (n = 415) were positive for HRSV, and 65.0% of them (n = 270) were identified as HRSV-A and 35.0% (n = 145) as HRSV-B. There were two major HRSV outbreaks: between June 2008 and February 2009, and between June and March 2012. Majority of HRSV strains detected during the former outbreak were HRSV-A (97.5%, 203/208) whereas during the later outbreak, both HRSV-A (54/158, 34.2%) and HRSV-B (104/158, 65.8%) were detected. All HRSV-A strains were classified as genotype NA1 and all HRSV-B as genotype BA, which had 60-nucleotide duplication in secondary hypervariable region of the G gene. Among HRSV-B positive samples, there were 2 distinct clusters with unique amino acid changes and low homology in compared to other strains in BA, suggesting emergence of new variant of HRSV-B.<br />Conclusion: The study provides an overview of the genetic variation in circulating HRSV viruses in the Philippines along with identification of possibly a novel variant of HRSV-B.<br /> (Copyright © 2013 Elsevier B.V. All rights reserved.)
- Subjects :
- Adolescent
Amino Acid Sequence
Child
Child, Preschool
Cluster Analysis
Genotype
Hospitalization
Humans
Infant
Infant, Newborn
Molecular Epidemiology
Molecular Sequence Data
Morbidity
Nasopharynx
Philippines epidemiology
Phylogeny
Prospective Studies
Respiratory Syncytial Virus Infections epidemiology
Respiratory Syncytial Viruses classification
Respiratory Syncytial Viruses isolation & purification
Sequence Alignment
Viral Envelope Proteins genetics
Respiratory Syncytial Virus Infections virology
Respiratory Syncytial Viruses genetics
Subjects
Details
- Language :
- English
- ISSN :
- 1873-5967
- Volume :
- 57
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology
- Publication Type :
- Academic Journal
- Accession number :
- 23357644
- Full Text :
- https://doi.org/10.1016/j.jcv.2013.01.001