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Updated: May 30, 2026

Generation, Amplification, and Titration of Recombinant Respiratory Syncytial Viruses
Published on: April 4, 2019
RNA viruses in young Nepalese children hospitalized with severe pneumonia
Maria Mathisen1, Sudha Basnet, Arun Sharma
1Department of Microbiology and Infection Control, University Hospital of North Norway, Tromsø, Norway. maria.mathisen2@unn.no
Insights
Respiratory syncytial virus (RSV) was the main cause of severe pneumonia in young children in Nepal. This study highlights RSV as a dominant viral pathogen in hospitalized children with severe pneumonia.
Area of Science:
- Pediatric Infectious Diseases
- Virology
- Public Health
Background:
- Pneumonia is a major global cause of childhood mortality, especially in low-income countries.
- Limited data exists on the viral causes of severe pneumonia in these high-burden regions.
Purpose of the Study:
- To investigate the viral etiology of severe pneumonia in young children in Nepal.
- To identify the predominant respiratory viruses associated with severe pneumonia hospitalizations.
Main Methods:
- Analysis of nasopharyngeal aspirates from 629 children (2-35 months) with severe pneumonia in Kathmandu, Nepal (2006-2008).
- Detection of 7 respiratory viruses using reverse transcription polymerase chain reaction (RT-PCR).
Main Results:
- Respiratory viruses were detected in 30% of children.
- Respiratory syncytial virus (RSV) was the most frequently identified virus (14%), followed by influenza A (4.5%) and parainfluenza virus (PIV) types (3, 1, 2).
- Severe pneumonia peaks coincided with RSV infection peaks, particularly during the monsoon and winter seasons.
Conclusions:
- Respiratory syncytial virus (RSV) is the dominant viral pathogen causing severe pneumonia in hospitalized young children in Nepal.
- Understanding viral etiologies is crucial for managing childhood pneumonia in resource-limited settings.
Background:
Pneumonia is among the leading causes of illness and death in children <5 years of age worldwide. There is little information on the viral etiology of severe pneumonia in low-income countries, where the disease burden is particularly high.
Methods:
We analyzed nasopharyngeal aspirates from 629 children 2 to 35 months of age meeting World Health Organization criteria for severe pneumonia and presenting at Kanti Children's Hospital, Kathmandu, Nepal, from January 2006 through June 2008. We examined one specimen from each child for 7 respiratory viruses using reverse transcription polymerase chain reaction.
Results:
We detected one or more respiratory viruses in 188 (30%; confidence interval: 26.4%-33.7%) of the 627 specimens with a valid polymerase chain reaction result, of which 88 (14%) yielded respiratory syncytial virus (RSV), 28 (4.5%) influenza A, 24 (5.8%) parainfluenza virus (PIV) type 3, 23 (3.7%) PIV type 1, 17 (2.7%) influenza B, 9 (1.4%) human metapneumovirus, and 5 (0.8%) PIV type 2. Episodes of severe pneumonia occurred in an epidemic pattern with 2 main annual peaks, the viral infections contributing importantly to these epidemics. The largest peaks of severe pneumonia coincided with peaks of RSV infection, which occurred during the last part of the monsoon season and in winter.
Conclusions:
RSV was the dominant respiratory viral pathogen detected in young Nepalese children hospitalized with severe pneumonia.
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