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Updated: Aug 3, 2026
An In vitro Model to Study Immune Responses of Human Peripheral Blood Mononuclear Cells to Human Respiratory Syncytial Virus Infection
Published on: December 11, 2013
Respiratory syncytial virus prophylaxis and the "special population"
Virginia Mirra1,2, Nicola Ullmann3,2, Claudio Cherchi1,2
1Unit of Paediatric Pulmonology and Respiratory Intermediate Care, Academic Department of Paediatrics, Paediatric Hospital "Bambino Gesù" Research Institute, Rome, Italy.
Insights
Respiratory Syncytial Virus (RSV) causes severe illness in high-risk infants. Palivizumab prophylaxis is used, but its efficacy in these special populations requires further review.
Area of Science:
- Pediatrics
- Infectious Diseases
- Immunology
Background:
- Bronchiolitis is a common infant respiratory infection, frequently caused by Respiratory Syncytial Virus (RSV).
- RSV can lead to severe disease, hospitalization, and mortality in specific high-risk pediatric populations.
- These special populations include infants with congenital heart disease, neuromuscular impairment, cystic fibrosis, Down Syndrome, and immunodeficiencies.
Purpose of the Study:
- To review literature identifying conditions that place children at higher risk for severe RSV infection.
- To provide an overview of palivizumab's efficacy in preventing RSV infection in these specific high-risk populations.
Main Methods:
- Literature review of various high-risk conditions for severe RSV infection.
- Analysis of existing data on palivizumab prophylaxis in special populations.
Main Results:
- High-risk populations experience a 3- to 10-fold increased rate of RSV hospitalization.
- Evidence regarding the safety and efficacy of palivizumab in these specific groups is limited.
- Randomized clinical trials are often not feasible due to the low incidence of these conditions.
Conclusions:
- Palivizumab is indicated for RSV prophylaxis in certain high-risk infants.
- Further evidence is needed to fully establish the safety and efficacy of palivizumab in special populations.
- Identifying and managing RSV risk in vulnerable infants remains a critical area in pediatric infectious disease.
Abstract:
Bronchiolitis is the most frequent airway infection in the first 2 years of life, and the respiratory syncytial virus (RSV) is the most frequently responsible virus. In selected high-risk groups, RSV may cause severe respiratory disease leading to hospitalization, need for mechanical ventilation, and even death. These high-risk groups include children with congenital heart disease, infants with neuromuscular impairment, cystic fibrosis, Down Syndrome, immunodeficiency syndromes and others specific conditions. In these high-risk populations defined in literature as "special population", a 3- to 10-fold increase in the rate of RSV hospitalization has been observed, justifying RSV specific prophylaxis with palivizumab, a monoclonal antibody that binds a viral glycoprotein epitope and blocks the link between RSV and target cell. Evidence of safety and efficacy of RSV prophylaxis in these populations is lacking. Given the low incidence of these conditions, randomized clinical trials are not feasible. The purpose of this paper is to give an update from the literature of various conditions at higher risk to develop severe RSV infection, and to offer an overview of the efficacy of palivizumab in preventing RSV infection in these specific populations.
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