The origin and continuing adaptive evolution of chikungunya virus

Area of Science:

• Virology
• Epidemiology
• Public Health

Background:

• Chikungunya virus (CHIKV) causes chikungunya fever, a debilitating arthritic illness.
• Historically endemic to Africa and Asia, CHIKV outbreaks were localized and rarely fatal before 2004.
• Recent global reemergence signifies a growing viral threat due to increased travel and adaptation to new vectors.

Purpose of the Study:

• To review the biology and origin of CHIKV in Africa.
• To examine the virus's expansion and adaptation to new vectors and hosts globally.
• To understand CHIKV evolution for predicting future transmission dynamics.

Main Methods:

• Literature review of CHIKV epidemiology, virology, and evolutionary studies.
• Analysis of CHIKV transmission cycles in Africa, Asia, and globally.
• Examination of vector adaptation, particularly Aedes albopictus.

Main Results:

• CHIKV has rapidly expanded geographically, facilitated by global travel and adaptation to Aedes albopictus.
• Aedes albopictus's resilience in diverse climates enables CHIKV spread to non-endemic regions.
• The virus's evolution poses challenges for vaccine and antiviral therapy development.

Conclusions:

• Understanding CHIKV's continuous evolution is crucial for predicting future outbreaks and strain emergence.
• Effective containment strategies and therapeutic developments are needed to address the global health challenge posed by CHIKV.
• The adaptability of CHIKV to vectors and hosts underscores the need for ongoing surveillance and research.