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Widespread Usutu virus outbreak in birds in the Netherlands, 2016 - Eurosurveillance

Gert van der Hoek

In Memoriam - Editor, Senior Moderator
Eurosurveillance, Volume 21, Issue 45, 10 November 2016
Rapid communication

[FONT=&quot] WIDESPREAD USUTU VIRUS OUTBREAK IN BIRDS IN THE NETHERLANDS, 2016

We report a widespread Usutu virus outbreak in birds in the Netherlands. Viral presence had been detected through targeted surveillance as early as April 2016 and increased mortality in common blackbirds and captive great grey owls was noticed from August 2016 onwards. Usutu virus infection was confirmed by post-mortem examination and RT-PCR. Extensive Usutu virus activity in the Netherlands in 2016 underlines the need to monitor mosquito activity and mosquito-borne infections in 2017 and beyond.



The emergence of USUV in the Netherlands illustrates the continuous geographical expansion of zoonotic arboviruses in Europe, documented elsewhere [8]. It serves as another warning of the expanding geographical range of regions suitable for sustained arbovirus circulation. In areas with endemic circulation, human infections seem to occur very rarely with only 13 human cases described in literature until now [19]. Human clinical cases present with neurological signs, fever, rash, jaundice or combinations thereof. Subclinical human USUV infections are a concern in blood transfusions or organ transplants [20], and recent data from Italy suggest that subclinical cases in regions with sustained USUV circulation may be more common than previously thought [19]. The same study showed that USUV was the cause of previously unexplained encephalitis cases [19], indicating that USUV should be included in the differential diagnosis of such cases in endemic areas. These recent public health findings suggest that USUV diagnostic capability and adequate USUV surveillance with molecular typing are warranted in regions shown to be suitable for USUV circulation. Although the 2016 mosquito season is coming to an end, physicians should be aware of putative USUV infection in cases of viral encephalitis of unknown aetiology, and vigilance should be maintained in the coming mosquito season in 2017.


Cumulative number of mosquitoes found per year, at the sites of four used tyre companies, the Netherlands, week 22 to week 37 (end of May to mid-September)



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