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Published on: June 9, 2011
West nile virus: an historical overview.
1Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA.
Ochsner Journal
|July 19, 2011
Summary
West Nile virus (WNV) has rapidly spread in North America since 1999. Recent WNV outbreaks show increased severity and geographic reach, challenging historical patterns and future prediction.
Area of Science:
- Epidemiology
- Virology
- Public Health
Background:
- West Nile virus (WNV) emerged in North America in 1999.
- Historically, WNV caused sporadic, mild febrile illnesses.
- Recent WNV activity suggests evolving epidemiology and clinical presentations.
Purpose of the Study:
- To analyze the changing patterns of West Nile virus in North America.
- To assess the increased severity and geographic spread of recent WNV outbreaks.
- To evaluate the predictive value of historical WNV data for future trends.
Main Methods:
- Review of historical WNV surveillance data.
- Analysis of epidemiological trends from 1999 onwards.
- Comparison of outbreak characteristics over time.
Main Results:
- WNV rapidly established in North America post-1999.
- The 2002 North American outbreak was unprecedented in scale and spread.
- Recent WNV outbreaks are more frequent and associated with severe illness.
Conclusions:
- WNV epidemiology in North America has significantly changed.
- Historical data offers limited insight into future WNV behavior.
- Continued surveillance and research are crucial for managing WNV.
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