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Int. J. Mol. Sci. 2017, 18(3), 654; doi:10.3390/ijms18030654

Genomic Loads and Genotypes of Respiratory Syncytial Virus: Viral Factors during Lower Respiratory Tract Infection in Chilean Hospitalized Infants

Department of Pediatrics and Pediatric Surgery, Hospital Roberto del Río, Facultad de Medicina, Universidad de Chile, Profesor Zañartu 1085, Independencia, 8380418 Santiago, Chile
Virology Program, Institute of Biomedical Sciences (ICBM), Facultad de Medicina, Universidad de Chile, Independencia 1027, Pabellón J. Independencia, 8380453 Santiago, Chile
Department of Pediatrics and Molecular Biology Laboratory, Hospital Luis Calvo Mackenna, Facultad de Medicina, Universidad de Chile, Av. Antonio Varas 360, Providencia, 7500539 Santiago, Chile
Department of Molecular Virology and Microbiology, Baylor College of Medicine, One Baylor Plaza, Room 248E, Houston, TX 77030, USA
Pediatrics, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Susanna Esposito
Received: 30 December 2016 / Revised: 2 March 2017 / Accepted: 13 March 2017 / Published: 21 March 2017
(This article belongs to the Special Issue Pneumonia: Pathogenesis, Diagnostics, Therapeutics, and Prevention)
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The clinical impact of viral factors (types and viral loads) during respiratory syncytial virus (RSV) infection is still controversial, especially regarding newly described genotypes. In this study, infants with RSV bronchiolitis were recruited to describe the association of these viral factors with severity of infection. RSV antigenic types, genotypes, and viral loads were determined from hospitalized patients at Hospital Roberto del Río, Santiago, Chile. Cases were characterized by demographic and clinical information, including days of lower respiratory symptoms and severity. A total of 86 patients were included: 49 moderate and 37 severe cases. During 2013, RSV-A was dominant (86%). RSV-B predominated in 2014 (92%). Phylogenetic analyses revealed circulation of GA2, Buenos Aires (BA), and Ontario (ON) genotypes. No association was observed between severity of infection and RSV group (p = 0.69) or genotype (p = 0.87). After a clinical categorization of duration of illness, higher RSV genomic loads were detected in infants evaluated earlier in their disease (p < 0.001) and also in infants evaluated later, but coursing a more severe infection (p = 0.04). Although types and genotypes did not associate with severity in our children, higher RSV genomic loads and delayed viral clearance in severe patients define a group that might benefit from new antiviral therapies. View Full-Text
Keywords: respiratory syncytial virus; RSV genotypes; viral load; severity respiratory syncytial virus; RSV genotypes; viral load; severity

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Espinosa, Y.; San Martín, C.; Torres, A.A.; Farfán, M.J.; Torres, J.P.; Avadhanula, V.; Piedra, P.A.; Tapia, L.I. Genomic Loads and Genotypes of Respiratory Syncytial Virus: Viral Factors during Lower Respiratory Tract Infection in Chilean Hospitalized Infants. Int. J. Mol. Sci. 2017, 18, 654.

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