Respiratory syncytial virus is an "opportunistic" killer
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Updated: Jun 26, 2026
An In vitro Model to Study Immune Responses of Human Peripheral Blood Mononuclear Cells to Human Respiratory Syncytial Virus Infection
Published on: December 10, 2013
Mauricio T Caballero1, Fernando P Polack1,2
1Fundacion INFANT, Buenos Aires, Argentina.
Insights
Respiratory syncytial virus (RSV) causes millions of hospitalizations and deaths in young children globally. New vaccines and treatments are in development to combat this leading pulmonary killer.
Area of Science:
- Pediatrics
- Infectious Diseases
- Public Health
Background:
- Respiratory syncytial virus (RSV) is a major cause of childhood respiratory illness, leading to millions of hospitalizations and significant mortality, particularly in children under five.
- Currently, no licensed vaccine exists for RSV, making prevention challenging, especially in developing countries where 99% of deaths occur.
- RSV fatalities often involve synergistic factors such as bacterial sepsis, pneumothorax, comorbidities, or social vulnerability, highlighting its opportunistic nature.
Purpose of the Study:
- To review the global impact of Respiratory Syncytial Virus (RSV) on pediatric mortality and hospitalizations.
- To discuss the contributing factors and co-factors associated with fatal RSV outcomes in both developing and industrialized nations.
- To highlight the current landscape of preventative and therapeutic interventions under clinical evaluation for RSV.
Main Methods:
- This review synthesizes data on RSV-related hospitalizations and deaths from global health statistics.
- It analyzes the clinical and social co-factors contributing to RSV mortality in different socioeconomic settings.
- The study examines the status of ongoing clinical trials for candidate vaccines, monoclonal antibodies, and antivirals targeting RSV.
Main Results:
- RSV is the primary pulmonary cause of death in children under five, responsible for over 118,000 deaths annually.
- Fatalities disproportionately affect children in developing countries and low-income families, often linked to specific co-factors.
- In industrialized nations, RSV deaths primarily occur in children with pre-existing conditions.
Conclusions:
- Respiratory syncytial virus (RSV) poses a significant global health threat to young children, necessitating urgent intervention strategies.
- The opportunistic nature of RSV-induced mortality underscores the need to address underlying medical, social, and environmental co-factors.
- The ongoing development of vaccines, monoclonal antibodies, and antivirals offers promising prospects for altering the future burden of RSV infections.
Abstract:
Respiratory syncytial virus (RSV), responsible for more than three million yearly hospitalizations and up to 118 000 deaths in children under 5 years, is the leading pulmonary cause of death for this age group that lacks a licensed vaccine. Ninety-nine percent of deaths due to the virus occur in developing countries. In-hospital RSV fatalities affect previously healthy term infants in association with bacterial sepsis, clinically significant pneumothoraxes and, to a lesser extent, comorbid conditions. Community deaths affect low-income children from socially vulnerable families and appear to be as frequent as inpatient fatalities. In industrialized countries, RSV deaths occur almost exclusively in children with premorbid conditions. In a sense, RSV is an "opportunistic" killer. It needs a synergistic premorbid, medical practice-related, infectious, or social co-factor to cause a fatal outcome. But while the complex problems associated with these co-factors await solutions, candidate vaccines, long-lived monoclonal antibodies and antivirals against RSV are under clinical evaluation. It seems reasonable to predict that the landscape of RSV infections will look different in the next decade.
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