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Emergent Risk Group-4 (RG-4) Filoviruses: A paradox in progress
John T Sinnott1, Kami Kim1, Charurut Somboonwit1
1Division of Infectious Diseases and International Health, Department of Internal Medicine, Morsani College of Medicine, Tampa, Florida 33606. USA.
Abstract:
Filoviruses, categorized as World Health Organization (WHO) Risk Group 4 (RG-4) pathogens, represent significant global health risks due to their extraordinary virulence. The Filoviridae family encompasses Ebola strains such as Sudan, Zaire, Bundibugyo, Tai Forest (formerly known as Ivory Coast), Reston, and Bombali, in addition to the closely related Marburg and Ravn virus strains. Filoviruses originated from a common ancestor about 10,000 years ago and displayed remarkable consistency in genetic heterogeneity until the 20th century. However, they overcame a genetic bottleneck by mid-century. Paradoxically, this resulted in the emergence of boosted virulent strains from the 1970's onward. Filovirus research is included in the NIAID Biodefense Program and utilizes the highest level specialized protective laboratories, Biosafety Laboratory (BSL)-4. The spread of Filoviruses as well as other RG-4 pathogens within Africa poses a significant health threat increasingly both in Africa and out of Africa.
Insights
Filoviruses, including Ebola and Marburg virus strains, are highly virulent World Health Organization (WHO) Risk Group 4 pathogens. Recent genetic changes have led to increased virulence, posing significant global health risks.
Area of Science:
- Virology
- Pathogen Research
- Public Health
Background:
- Filoviruses (Ebola, Marburg) are WHO Risk Group 4 pathogens known for high virulence.
- The Filoviridae family includes multiple Ebola virus strains and related viruses.
Discussion:
- Filoviruses evolved from a common ancestor ~10,000 years ago, showing genetic stability until the 20th century.
- A genetic bottleneck mid-20th century paradoxically led to increased virulence in strains emerging from the 1970s.
- Research on these high-risk pathogens is conducted in specialized Biosafety Laboratory (BSL)-4 facilities.
Key Insights:
- Filoviruses exhibit extraordinary virulence, posing significant global health risks.
- Emergence of boosted virulent strains after a genetic bottleneck highlights evolving pathogen threats.
- The spread of Filoviruses and other RG-4 pathogens in and out of Africa is a growing public health concern.
Outlook:
- Continued surveillance and research are crucial for understanding and mitigating filovirus threats.
- Enhanced biodefense strategies are necessary to address the increasing risk of RG-4 pathogen spread.
- International collaboration is essential for managing global health security against virulent viruses.
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