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[Primary infection with West-Nile virus]
J L Estival1, F Skowron, M Dupin
1Clinique de Dermatologie, Hôpital d'Instruction des Armées Desgenettes, 108, boulevard Pinel, 69275 Lyon Cedex 03.
Annales De Dermatologie Et De Venereologie
|June 28, 2001
Summary
West Nile virus can cause mild febrile illness with rash, as seen in a traveler returning from Senegal. While typically self-limiting, prompt diagnosis via serology is crucial for West Nile fever management.
Area of Science:
- Virology
- Epidemiology
- Infectious Diseases
Background:
- West Nile virus (WNV) outbreaks, like the one in New York, highlight its role in fatal encephalitis.
- However, WNV infections can also present with mild clinical manifestations.
Observation:
- A 41-year-old woman developed acute febrile rash post-travel to Senegal.
- The illness featured a biphasic fever and resolved spontaneously within 5 days.
Findings:
- Reverse passive hemagglutination confirmed West Nile fever.
- WNV, a mosquito-borne flavivirus, often causes a flu-like illness with rash in 50% of cases.
- Biphasic fever patterns suggest WNV infection.
Implications:
- Serological tests are key for WNV diagnosis, though cross-reactivity with other flaviviruses can complicate interpretation.
- While recovery is usually rapid, severe meningoencephalitis is a risk, particularly in the elderly.
- Supportive care is the primary treatment; prevention involves minimizing human exposure to mosquitoes.