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[Usutu virus: let's be vigilant].

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Usutu virus (USUV), an emerging arbovirus, is spreading in Europe and causing bird deaths. While often asymptomatic in humans, USUV can cause neurological issues like Bell's palsy, indicating a broader clinical spectrum than previously known.

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Area of Science:

  • Virology
  • Epidemiology
  • Neurology

Background:

  • Usutu virus (USUV) is an emerging flavivirus, related to West Nile virus (WNV).
  • First isolated in South Africa in 1959, USUV has spread across Europe, notably causing significant bird mortality in 2018.
  • Human infections are typically asymptomatic, but neurological complications such as encephalitis have been documented.

Purpose of the Study:

  • To investigate the expanding clinical spectrum of Usutu virus infections in humans.
  • To highlight the potential for USUV to cause neurological conditions beyond typical presentations.
  • To underscore the need for further research into USUV pathophysiology.

Main Methods:

  • Case report of an atypical Usutu virus infection.
  • Review of existing literature on USUV clinical manifestations.
  • Analysis of epidemiological data on USUV spread.

Main Results:

  • An atypical case of Bell's palsy associated with Usutu virus infection was described in Montpellier.
  • This case suggests that the clinical presentation of USUV infection may be more diverse than previously recognized.
  • The findings indicate a potential underestimation of USUV's neurological impact.

Conclusions:

  • Usutu virus infections can present with atypical neurological symptoms, such as Bell's palsy.
  • The clinical spectrum of USUV is likely broader than currently understood.
  • Further research is crucial to elucidate the pathophysiology and full clinical impact of this emerging arbovirus.