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[Usutu virus: the phantom menace].

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Usutu virus, an emerging arbovirus, is spreading in Europe, causing bird deaths and posing a potential zoonotic risk. While human cases are rare, neurological complications like encephalitis and facial paralysis highlight the need for vigilance.

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Area of Science:

  • Veterinary Virology
  • Public Health Entomology
  • Zoonotic Disease Surveillance

Background:

  • Usutu virus (USUV), an arbovirus first identified in Africa, has expanded its presence across Europe over the past two decades.
  • Significant avian mortality events linked to USUV have been documented in Europe, notably in France since 2015.
  • The potential zoonotic implications of USUV require consideration, despite the current rarity of human infections.

Purpose of the Study:

  • To review the epidemiology and clinical manifestations of Usutu virus in Europe.
  • To assess the zoonotic risk associated with Usutu virus outbreaks in birds.
  • To emphasize the importance of continued surveillance and research into Usutu virus.

Main Methods:

  • Literature review of Usutu virus epidemiology and clinical cases.
  • Analysis of reported avian epizootics and human Usutu virus infections.
  • Synthesis of current knowledge on Usutu virus transmission and clinical spectrum.

Main Results:

  • Usutu virus has established itself across a significant portion of Europe, leading to substantial bird mortality.
  • Human Usutu virus infections are typically asymptomatic or mild, but severe neurological conditions including encephalitis and meningoencephalitis have occurred.
  • An atypical case of facial paralysis in France suggests the full clinical spectrum of Usutu virus infection may not yet be understood.

Conclusions:

  • Usutu virus represents a growing public health concern in Europe due to its spread and impact on bird populations.
  • The potential for neurological complications in humans warrants increased awareness and diagnostic consideration.
  • Vigilance and further research are crucial, informed by the history of other arboviral emergence events.