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Assays for the Specific Growth Rate and Cell-binding Ability of Rotavirus
Published on: January 28, 2019
Rotavirus diversity and evolution in the post-vaccine world
1Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA. jpatton@niaid.nih.gov
Discovery Medicine
|January 31, 2012
Summary
Rotaviruses (RVs) cause severe infant gastroenteritis globally. While vaccines are effective, ongoing surveillance is crucial to monitor for viral genetic changes that could impact long-term vaccine efficacy.
Area of Science:
- Virology
- Genetics
- Epidemiology
Background:
- Rotaviruses (RVs) are a diverse group of segmented double-stranded RNA viruses responsible for significant infant gastroenteritis and mortality, particularly in developing nations.
- Human RV genomes feature eleven dsRNA segments, often forming co-evolved constellations that optimize viral replication.
- Two outer capsid proteins, VP7 and VP4, determine the RV's G/P type, which can fluctuate due to distinct RV clades.
Purpose of the Study:
- To investigate the genetic diversity and evolutionary dynamics of human rotaviruses.
- To assess the impact of live attenuated rotavirus vaccines (RotaTeq and Rotarix) on circulating RV strains.
- To highlight the necessity of continued rotavirus surveillance in the context of vaccination programs.
Main Methods:
- Analysis of large-scale human rotavirus genome sequencing data.
- Phylogenetic analysis to identify viral constellations and genetic clades.
- Monitoring of G/P type distribution and fluctuations in disease-associated RVs.
Main Results:
- Human RV genomes exhibit phylogenetically linked constellations of eleven dsRNA segments, suggesting co-evolution.
- Significant year-to-year and geographical fluctuations in G/P types of disease-associated human RVs have been observed.
- Recent rotavirus vaccines have shown high effectiveness in reducing diarrheal disease incidence.
Conclusions:
- The genetic diversity and fluctuating G/P types of human rotaviruses necessitate ongoing monitoring.
- The long-term effectiveness of current rotavirus vaccines may be influenced by selective pressures leading to viral evolution.
- Continued surveillance is essential to detect and respond to potential vaccine escape or reduced efficacy due to rotavirus genetic changes.
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