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Gonzales T, Bergamasco A, Cristarella T, Goyer C, Wojdyla M, Oladapo A, Sawicky J, Yee J, Moride Y. Effectiveness and Safety of Palivizumab for the Prevention of Serious Lower Respiratory Tract Infection Caused by Respiratory Syncytial Virus: A Systematic Review. Am J Perinatol 2024; 41:e1107-e1115. [PMID: 36452969 PMCID: PMC11108679 DOI: 10.1055/a-1990-2633] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 11/09/2022] [Indexed: 12/02/2022]
Abstract
OBJECTIVE  Palivizumab is a humanized monoclonal antibody approved for the prevention of serious lower respiratory tract infection (LRTI) caused by respiratory syncytial virus (RSV) in infants and young children at high risk of RSV disease. This systematic review summarized evidence on the effectiveness and safety of palivizumab when used in approved populations. STUDY DESIGN  A systematic review of Phase III trials and observational studies was conducted according to the population, intervention, comparator, outcome, timing, setting (PICOTS) approach (PROSPERO, CRD42021281380). Target populations consisted of infants with a history of premature birth (≤35-week gestational age) and children aged <2 years with bronchopulmonary dysplasia (BPD) or with hemodynamically significant congenital heart disease (hs-CHD). Outcomes of interest included RSV-related hospitalization, admission to intensive care unit (ICU), requirement for mechanical ventilation, treatment-related adverse events (AEs), and RSV-related deaths. Information sources were literature search (Ovid MEDLINE and Embase), pragmatic searches, and snowballing (covering the period up to 07 September 2021). RESULTS  A total of 60 sources were included (5 Phase III trials and 55 observational studies). RSV-related hospitalization rates following palivizumab prophylaxis in Phase III trials were 1.8% in premature infants and 7.9% in children with BPD, which were significantly lower than rates in placebo arms. In the real-world setting, similar hospitalization rates were found (0.7-4.0% in premature infants [16 studies] and 0-5.5% in patients with BPD [10 studies]) with ICU admission reported in 0 to 33.3% of patients hospitalized for RSV. In Phase III trials, RSV-related mortality rates were 0.2 and 0.3%, while AEs occurred in 11% of premature and/or BPD patients and 7.2% of hs-CHD patients, consisting mainly of injection site reaction, fever, and diarrhea. Similar results were found in observational studies. CONCLUSION  This systematic review supports the effectiveness and safety of palivizumab in the indicated populations. KEY POINTS · Systematic review supports the positive benefit-risk profile of palivizumab in the indicated populations.. · Real-world safety and effectiveness of palivizumab are consistent with Phase III trials results.. · Palivizumab reduces RSV-related hospitalizations, ICU admissions, and need for mechanical ventilation..
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Affiliation(s)
- Tara Gonzales
- SOBI Inc, Specialty Care North America, Waltham, Massachusetts
| | | | | | - Camille Goyer
- YOLARX Consultants Inc, 3550 Côte-des-Neiges Road, Montréal, QC, Canada
| | - Matthew Wojdyla
- SOBI Inc, Specialty Care North America, Waltham, Massachusetts
| | - Abiola Oladapo
- SOBI Inc, Specialty Care North America, Waltham, Massachusetts
| | - John Sawicky
- SOBI Inc, Specialty Care North America, Waltham, Massachusetts
| | - John Yee
- SOBI Inc, Specialty Care North America, Waltham, Massachusetts
| | - Yola Moride
- YOLARX Consultants SAS, 101, rue de Sèvres, Paris Cedex 6, France
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Carbonell-Estrany X, Rodgers-Gray BS, Paes B. Challenges in the prevention or treatment of RSV with emerging new agents in children from low- and middle-income countries. Expert Rev Anti Infect Ther 2020; 19:419-441. [PMID: 32972198 DOI: 10.1080/14787210.2021.1828866] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
INTRODUCTION Respiratory syncytial virus (RSV) causes approximately 120,000 deaths annually in children <5Â years, with 99% of fatalities occurring in low- and middle-income countries (LMICs). AREAS COVERED There are numerous RSV interventions in development, including long-acting monoclonal antibodies, vaccines (maternal and child) and treatments which are expected to become available soon. We reviewed the key challenges and issues that need to be addressed to maximize the impact of these interventions in LMICs. The epidemiology of RSV in LMICs was reviewed (PubMed search to 30 June 2020 inclusive) and the need for more and better-quality data, encompassing hospital admissions, community contacts, and longer-term respiratory morbidity, emphasized. The requirement for an agreed clinical definition of RSV lower respiratory tract infection was proposed. The pros and cons of the new RSV interventions are reviewed from the perspective of LMICs. EXPERT OPINION We believe that a vaccine (or combination of vaccines, if practicable) is the only viable solution to the burden of RSV in LMICs. A coordinated program, analogous to that with polio, involving governments, non-governmental organizations, the World Health Organization, the manufacturers and the healthcare community is required to realize the full potential of vaccine(s) and end the devastation of RSV in LMICs.
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Affiliation(s)
- Xavier Carbonell-Estrany
- Neonatology Service, Hospital Clinic, Institut d'Investigacions Biomediques August Pi Suñer (IDIBAPS), Barcelona, Spain
| | | | - Bosco Paes
- Department of Pediatrics (Neonatal Division), McMaster University, Hamilton, Ontario, Canada
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Hu M, Bogoyevitch MA, Jans DA. Impact of Respiratory Syncytial Virus Infection on Host Functions: Implications for Antiviral Strategies. Physiol Rev 2020; 100:1527-1594. [PMID: 32216549 DOI: 10.1152/physrev.00030.2019] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Respiratory syncytial virus (RSV) is one of the leading causes of viral respiratory tract infection in infants, the elderly, and the immunocompromised worldwide, causing more deaths each year than influenza. Years of research into RSV since its discovery over 60 yr ago have elucidated detailed mechanisms of the host-pathogen interface. RSV infection elicits widespread transcriptomic and proteomic changes, which both mediate the host innate and adaptive immune responses to infection, and reflect RSV's ability to circumvent the host stress responses, including stress granule formation, endoplasmic reticulum stress, oxidative stress, and programmed cell death. The combination of these events can severely impact on human lungs, resulting in airway remodeling and pathophysiology. The RSV membrane envelope glycoproteins (fusion F and attachment G), matrix (M) and nonstructural (NS) 1 and 2 proteins play key roles in modulating host cell functions to promote the infectious cycle. This review presents a comprehensive overview of how RSV impacts the host response to infection and how detailed knowledge of the mechanisms thereof can inform the development of new approaches to develop RSV vaccines and therapeutics.
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Affiliation(s)
- MengJie Hu
- Department of Biochemistry and Molecular Biology, University of Melbourne, Melbourne, Victoria, Australia; and Department of Biochemistry and Molecular Biology, Monash University, Melbourne, Victoria, Australia
| | - Marie A Bogoyevitch
- Department of Biochemistry and Molecular Biology, University of Melbourne, Melbourne, Victoria, Australia; and Department of Biochemistry and Molecular Biology, Monash University, Melbourne, Victoria, Australia
| | - David A Jans
- Department of Biochemistry and Molecular Biology, University of Melbourne, Melbourne, Victoria, Australia; and Department of Biochemistry and Molecular Biology, Monash University, Melbourne, Victoria, Australia
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Simões EAF, Bont L, Manzoni P, Fauroux B, Paes B, Figueras-Aloy J, Checchia PA, Carbonell-Estrany X. Past, Present and Future Approaches to the Prevention and Treatment of Respiratory Syncytial Virus Infection in Children. Infect Dis Ther 2018; 7:87-120. [PMID: 29470837 PMCID: PMC5840107 DOI: 10.1007/s40121-018-0188-z] [Citation(s) in RCA: 97] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Indexed: 12/27/2022] Open
Abstract
INTRODUCTION The REGAL (RSV Evidence - A Geographical Archive of the Literature) series has provided a comprehensive review of the published evidence in the field of respiratory syncytial virus (RSV) in Western countries over the last 20 years. This seventh and final publication covers the past, present and future approaches to the prevention and treatment of RSV infection among infants and children. METHODS A systematic review was undertaken of publications between January 1, 1995 and December 31, 2017 across PubMed, Embase and The Cochrane Library. Studies reporting data on the effectiveness and tolerability of prophylactic and therapeutic agents for RSV infection were included. Study quality and strength of evidence (SOE) were graded using recognized criteria. A further nonsystematic search of the published literature and Clinicaltrials.gov on antiviral therapies and RSV vaccines currently in development was also undertaken. RESULTS The systematic review identified 1441 studies of which 161 were included. Management of RSV remains centered around prophylaxis with the monoclonal antibody palivizumab, which has proven effective in reducing RSV hospitalization (RSVH) in preterm infants < 36 weeks' gestational age (72% reduction), children with bronchopulmonary dysplasia (65% reduction), and infants with hemodynamically significant congenital heart disease (53% reduction) (high SOE). Palivizumab has also shown to be effective in reducing recurrent wheezing following RSVH (high SOE). Treatment of RSV with ribavirin has conflicting success (moderate SOE). Antibodies with increased potency and extended half-life are currently entering phase 3 trials. There are approximately 15 RSV vaccines in clinical development targeting the infant directly or indirectly via the mother. CONCLUSION Palivizumab remains the only product licensed for RSV prophylaxis, and only available for high-risk infants. For the general population, there are several promising vaccines and monoclonal antibodies in various stages of clinical development, with the aim to significantly reduce the global healthcare impact of this common viral infection. FUNDING AbbVie.
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Affiliation(s)
- Eric A F Simões
- Center for Global Health, Colorado School of Public Health, University of Colorado School of Medicine, Aurora, CO, USA
| | - Louis Bont
- University Medical Center Utrecht, Utrecht, The Netherlands
- ReSViNET (Respiratory Syncytial Virus Network), Utrecht, The Netherlands
| | - Paolo Manzoni
- ReSViNET (Respiratory Syncytial Virus Network), Utrecht, The Netherlands
- Neonatology and NICU, Sant'Anna Hospital, Turin, Italy
| | - Brigitte Fauroux
- Necker University Hospital and Paris 5 University, Paris, France
| | - Bosco Paes
- Department of Paediatrics (Neonatal Division), McMaster University, Hamilton, Canada
| | - Josep Figueras-Aloy
- Hospital ClÃnic, Catedrà tic de Pediatria, Universitat de Barcelona, Barcelona, Spain
| | - Paul A Checchia
- Baylor College of Medicine, Texas Children's Hospital Houston, Houston, TX, USA
| | - Xavier Carbonell-Estrany
- Hospital Clinic, Institut d'Investigacions Biomediques August Pi Suñer (IDIBAPS), Barcelona, Spain.
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Palivizumab Exposure and the Risk of Atopic Dermatitis, Asthma and Allergic Rhinoconjunctivitis: A Cross-National, Population-Based Cohort Study. Paediatr Drugs 2017; 19:155-164. [PMID: 28188494 DOI: 10.1007/s40272-017-0215-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
BACKGROUND Palivizumab is a humanized monoclonal antibody designed to provide passive immunity against respiratory syncytial virus. It is prescribed to children at high risk for severe infection with respiratory syncytial virus. However, little is known about the risk of the immune-mediated diseases atopic dermatitis, asthma, and allergic rhinoconjunctivitis after palivizumab exposure. AIM Our objective was to investigate whether exposure to palivizumab was associated with atopic dermatitis, asthma, or allergic rhinoconjunctivitis in childhood. METHODS This was a cross-national population-based cohort study including data from 769,523 Danish children born 1 January 1999-31 December 2010 and 581,742 Swedish children born 1 July 2005-31 December 2010. Since palivizumab is only indicated for children at the highest risk, sub-cohorts of preterm children, children with bronchopulmonary dysplasia, and children with hemodynamic significant heart disease were defined. RESULTS Of the 1,351,265 children included, 1192 (0.09%) were exposed to palivizumab. An increased risk of asthma after palivizumab exposure was observed in the total birth cohort (hazard ratio [HR] 1.49; 95% confidence interval [CI] 1.32-1.68) and in the sub-cohort of preterm children (HR 1.24; 95% CI 1.07-1.44). However, post hoc analyses using the propensity score to balance confounding factors found no increased risk of asthma in preterm children (HR 0.91; 95% CI 0.56-1.48). No increased risks of atopic dermatitis (HR 1.18; 95% CI 0.94-1.48) or allergic rhinoconjunctivitis (HR 1.14; 95% CI 0.92-1.42) were observed. CONCLUSION Exposure to palivizumab neither increased the risk of atopic disease nor protected against asthma.
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Abraha HY, Lanctôt KL, Paes B. Risk of respiratory syncytial virus infection in preterm infants: reviewing the need for prevention. Expert Rev Respir Med 2015; 9:779-99. [PMID: 26457970 DOI: 10.1586/17476348.2015.1098536] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Premature infants are at substantial risk for a spectrum of morbidities that are gestational age dependent. Respiratory syncytial virus (RSV) infection is most common in the first two years of life with the highest burden in children aged <6 months. Preterm infants ≤35 weeks' gestation are handicapped by incomplete immunological and pulmonary maturation and immature premorbid lung function with the added risk of bronchopulmonary dysplasia. Superimposed RSV infection incites marked neutrophilic airway inflammation and innate immunological responses that further compromise normal airway modeling. This review addresses the epidemiology and burden of RSV disease, focusing on the preterm population. Risk factors that determine RSV-disease severity and hospitalization and the impact on healthcare resource utilization and potential long-term respiratory sequelae are discussed. The importance of disease prevention and the evidence-based rationale for prophylaxis with palivizumab is explored, while awaiting the development of a universal vaccine.
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Affiliation(s)
- Haben Y Abraha
- a Medical Outcomes and Research in Economics (MORE®) Research Group, Sunnybrook Health Sciences Centre , University of Toronto , Toronto , Ontario , Canada
| | - Krista L Lanctôt
- a Medical Outcomes and Research in Economics (MORE®) Research Group, Sunnybrook Health Sciences Centre , University of Toronto , Toronto , Ontario , Canada
| | - Bosco Paes
- b Division of Neonatology, Department of Pediatrics , McMaster University , Hamilton , Ontario , Canada
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Chen JJ, Chan P, Paes B, Mitchell I, Li A, Lanctôt KL. Serious Adverse Events in the Canadian Registry of Children Receiving Palivizumab (CARESS) for Respiratory Syncytial Virus Prevention. PLoS One 2015; 10:e0134711. [PMID: 26237402 PMCID: PMC4523213 DOI: 10.1371/journal.pone.0134711] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Accepted: 07/13/2015] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVES To evaluate the safety and tolerability of palivizumab for RSV prophylaxis in high-risk children in everyday practice. METHODS High-risk children prophylaxed against RSV infection were recruited into a prospective, observational, Canadian RSV Evaluation Study of Palivizumab (CARESS) registry with active, serious adverse event (SAE) monitoring from 2008 to 2013. SAE reports were systematically collected and assessed for severity and relationship to palivizumab. Data were analyzed by Chi-square or Fisher Exact Tests to examine group differences in proportions. RESULTS 13025 infants received 57392 injections. Hospitalizations for respiratory-related illness (RIH) were reported in 915 patients, and SAEs other than RIH were reported in 52 patients. Of these, 6 (0.05%) patients had a total of 14 hypersensitivity reactions that were deemed possibly or probably related to palivizumab (incidence: 2.8 per 10,000 patient-months). The SAEs of 42 patients were assessed as not related to palivizumab. SAEs in the remaining 4 patients were not classifiable as their records were incomplete. There were no significant demographic predictors of SAE occurrence. CONCLUSIONS Under active surveillance, a small proportion of infants in the CARESS registry experienced SAEs that had a potential relationship with palivizumab and these appeared to be unpredictable in terms of onset. Palivizumab appears to be a safe and well-tolerated antibody for RSV prophylaxis in high-risk children in routine practice.
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Affiliation(s)
- Jinghan Jenny Chen
- Medical Outcomes and Research in Economics (MORE) Research Group, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada
| | - Parco Chan
- Medical Outcomes and Research in Economics (MORE) Research Group, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada
| | - Bosco Paes
- Department of Pediatrics, McMaster University, Hamilton, Ontario, Canada
| | - Ian Mitchell
- Department of Pediatrics, University of Calgary, Calgary, Alberta, Canada
| | - Abby Li
- Medical Outcomes and Research in Economics (MORE) Research Group, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada
| | - Krista L. Lanctôt
- Medical Outcomes and Research in Economics (MORE) Research Group, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada
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Wegzyn C, Toh LK, Notario G, Biguenet S, Unnebrink K, Park C, Makari D, Norton M. Safety and Effectiveness of Palivizumab in Children at High Risk of Serious Disease Due to Respiratory Syncytial Virus Infection: A Systematic Review. Infect Dis Ther 2014; 3:133-58. [PMID: 25297809 PMCID: PMC4269625 DOI: 10.1007/s40121-014-0046-6] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Indexed: 11/23/2022] Open
Abstract
INTRODUCTION Lower respiratory tract infection (LRTI) is the leading cause of infant mortality globally in post-neonatal infants (i.e., 28-364Â days of age). Respiratory syncytial virus (RSV) is the most commonly identified pathogen for infant LRTI and is the second most important cause of death in post-neonatal infants. Despite 50Â years of RSV vaccine research, there is still no approved vaccine. Therefore, passive immunity with the monoclonal antibody palivizumab is the sole regulatory-approved option for the prevention of serious LRTI caused by RSV in pediatric patients at high risk of RSV disease. METHODS We conducted a comprehensive systematic literature review of randomized controlled trials (RCTs), open-label non-comparative clinical trials, and prospective observational studies/registries, and summarized the evidence related to the safety, efficacy, and effectiveness of palivizumab. RESULTS The efficacy of palivizumab, as measured by the relative reduction in RSV-related hospitalization rate compared with placebo ranged from 39% to 78% (PÂ <Â 0.05) in the 2 pivotal RCTs. A meta-analysis of the RSV-related hospitalization rate from 5 randomized placebo-controlled trials yielded an overall odds ratio of 0.41 (95% CI, 0.31-0.55) in favor of palivizumab prophylaxis over placebo (PÂ <Â 0.00001). Low rates of RSV-related hospitalizations were observed in palivizumab recipients consistently over time in more than 42,000 pediatric subjects across 7 RCTs, 4 open-label non-comparative trials, and 8 observational studies/registries conducted in 34 countries. In addition, among palivizumab-prophylaxed subjects with breakthrough RSV LRTI, rates of intensive care unit admission and mechanical ventilation from RSV hospitalization also were low and consistent across studies. With respect to safety, no differences were observed between palivizumab and placebo in the blinded RCTs. CONCLUSION Rates of RSV hospitalizations and RSV hospitalization-related endpoints in pediatric subjects who received prophylaxis with palivizumab were low and constant over time and across RCTs, open-label non-comparative trials, and observational studies/registries.
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Paynter S, Ware RS, Sly PD, Williams G, Weinstein P. Seasonal immune modulation in humans: observed patterns and potential environmental drivers. J Infect 2014; 70:1-10. [PMID: 25246360 DOI: 10.1016/j.jinf.2014.09.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 08/30/2014] [Accepted: 09/15/2014] [Indexed: 10/24/2022]
Abstract
INTRODUCTION Cyclical fluctuations in host immunity have been proposed as a driver of respiratory infection seasonality, however few studies have attempted to directly assess whether or not seasonal immune modulation occurs in humans. MATERIALS AND METHODS We reviewed studies assessing immune status at different times of the year, restricting our review to studies assessing any of the following three biomarkers: antibody responses following vaccination, delayed-type hypersensitivity responses following skin testing, and clinical responses following experimental infection. RESULTS After systematic review and critical appraisal of the literature, six separate studies were available for final discussion. These results indicate that human immunity does vary by season. In the tropical setting of West Africa, both cell mediated and humoral immune responses appear to be reduced in children during the rainy season. In the tropical setting of Bangladesh, cell mediated immune responses also appear to be reduced in children during the rainy season. In the temperate setting of Russia, resistance to influenza infection appears to be reduced in young adults during winter. CONCLUSIONS Seasonal variation in immunity appears to occur in humans, and it is plausible that this variation may contribute to the seasonality of respiratory infections. Further research to assess the extent of seasonal immune modulation is required. We outline a number of recommendations to minimise bias in future studies.
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Affiliation(s)
- Stuart Paynter
- School of Population Health, University of Queensland, Brisbane, Australia.
| | - Robert S Ware
- School of Population Health, University of Queensland, Brisbane, Australia; Queensland Children's Medical Research Institute, University of Queensland, Brisbane, Australia
| | - Peter D Sly
- Queensland Children's Medical Research Institute, University of Queensland, Brisbane, Australia
| | - Gail Williams
- School of Population Health, University of Queensland, Brisbane, Australia
| | - Philip Weinstein
- Faculty of Science, University of Adelaide, Adelaide, Australia; School of Pharmacy and Health Sciences, University of South Australia, Adelaide, Australia
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Tulloh RMR, Bury S. Prevention and prophylaxis of respiratory syncytial virus in pediatric cardiology: a UK perspective. Future Cardiol 2014; 10:235-42. [DOI: 10.2217/fca.14.4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
ABSTRACT:  Respiratory syncytial virus (RSV) is a common infection, causing bronchiolitis in over 70% of infants each year and almost all children by the age of 2. It is the leading cause of acute lower respiratory tract infections and admissions to hospital worldwide. Previously healthy infants may have a prolonged cough or wheezing following RSV infection but up to 20% of those with congenital cardiac disease will be hospitalized and have significant morbidity and mortality. For this reason, it is generally recommended that many such infants should receive prophylaxis against RSV infection with palivizumab. This paper reviews the current state of knowledge about RSV affecting children with congenital heart disease from the perspective of those living in the UK and the current protection offered to such children. We also discuss the plans for the future of protection against RSV.
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Affiliation(s)
- Robert MR Tulloh
- Department of Congenital Heart Disease, Bristol Royal Hospital for Children & Bristol Heart Institute, Bristol, BS2 8BJ, UK
| | - Sarah Bury
- Department of Congenital Heart Disease, Bristol Royal Hospital for Children & Bristol Heart Institute, Bristol, BS2 8BJ, UK
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