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An Improved and High Throughput Respiratory Syncytial Virus (RSV) Micro-neutralization Assay
Published on: January 26, 2019
The future of respiratory syncytial virus vaccine development
Fernando P Polack1, Ruth A Karron
1Department of Intenational Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA.
Insights
Developing a respiratory syncytial virus (RSV) vaccine remains challenging. While progress has been made with live attenuated and subunit vaccines, none are yet suitable for infants, necessitating further research.
Area of Science:
- Virology
- Immunology
- Vaccinology
Background:
- Respiratory syncytial virus (RSV) is a major cause of lower respiratory tract illness in infants and children.
- Despite extensive research, no licensed RSV vaccines are currently available.
- RSV disease impacts various age groups, highlighting the need for effective prevention.
Purpose of the Study:
- To review obstacles in developing RSV vaccines.
- To examine current live, attenuated, and subunit RSV vaccines in clinical trials.
- To explore the potential of recombinant technology for novel vaccine candidates.
Main Methods:
- Review of existing literature on RSV vaccine development.
- Analysis of clinical trial data for live attenuated and subunit RSV vaccines.
- Assessment of recombinant technology approaches for RSV vaccine design.
Main Results:
- Live attenuated RSV vaccines showed varying attenuation; none were sufficiently attenuated for infants.
- Recombinant technology has enabled numerous candidate vaccines with mutations and gene deletions.
- Clinical evaluations are ongoing for various candidate vaccines, including subunit vaccines like purified F glycoprotein and F/G/M protein combinations.
Conclusions:
- Significant advancements in RSV vaccine development have occurred in the last decade.
- Different RSV vaccines may be required for distinct at-risk populations.
- Continued research is crucial for developing safe and effective RSV vaccines.
Background:
Respiratory syncytial virus (RSV) is the leading cause of viral lower respiratory tract illness in infants and children and is an important cause of lower respiratory tract illness in other populations. Despite decades of research there are currently no licensed vaccines for prevention of RSV disease.
Methods:
A review of the obstacles to RSV vaccine development; current live, attenuated and subunit RSV vaccines in clinical development; and the potential for developing additional vaccine candidates based on recombinant technology.
Results:
A number of biologically derived live attenuated RSV vaccines were evaluated in Phase I clinical trials in adults and children, and one vaccine (cpts 248/404) was evaluated in infants as young as 1 month of age. These vaccines displayed a spectrum of attenuation, with cpts 248/955 being the least attenuated and cpts 248/404 being the most attenuated candidate vaccine. None of these was sufficiently attenuated for young infants. The ability to generate recombinant RSV vaccines has led to the development of large numbers of candidate vaccines containing combinations of known attenuating point mutations and deletions of nonessential genes. Clinical evaluation of many of these candidates is in progress. Three types of RSV subunit vaccines have recently been evaluated in clinical trials: purified F glycoprotein vaccines (PFP-1, PFP-2 and PFP-3), BBG2Na and copurified F, G and M proteins. Additional studies of the F/G/M protein vaccine are being conducted.
Conclusions:
During the past 10 years, considerable progress has been made in RSV vaccine development. It is likely that different RSV vaccines will be needed for the various populations at risk.
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