Human Usutu Virus Infections in Europe: A New Risk on Horizon?

Publisher: MDPI Country of Publication: Switzerland NLM ID: 101509722 Publication Model: Electronic Cited Medium: Internet ISSN: 1999-4915 (Electronic) Linking ISSN: 19994915 NLM ISO Abbreviation: Viruses Subsets: MEDLINE

Original Publication: Basel, Switzerland : MDPI

Flavivirus Infections*/epidemiology ; Flavivirus Infections*/veterinary ; Flavivirus* ; Culicidae* ; Nervous System Diseases*; Humans ; Animals ; Horses ; Europe/epidemiology ; Birds ; Mammals

The Usutu virus (USUV), a neurotropic mosquito-borne flavivirus discovered in 1959 in South Africa, has spread over the last twenty years across the European continent. This virus follows an enzootic cycle involving mosquitoes and birds. This caused epizootics with significant bird mortality in Europe in 2016 and 2018. It can also occasionally infect humans and other mammals, including horses and bats, which act as incidental or dead-end hosts. The zoonotic risk associated with this succession of avian epizootics in Europe deserves attention, even if, to date, human cases remain exceptional. Human infection is most often asymptomatic or responsible for mild clinical symptoms. However, human Usutu infections have also been associated with neurological disorders, such as encephalitis and meningoencephalitis. One of the major complexities of the study of USUV pathogenesis is the presence of a great diversity of lineages which could co-circulate spatiotemporally. In this review we discuss several aspects of the circulation of Usutu virus in humans in Europe, the neurological disorders associated, involved viral lineages, and the issues and questions raised by their circulation.

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Keywords: Usutu; flavivirus; neurological disorders

Usutu virus

Date Created: 20230121 Date Completed: 20230124 Latest Revision: 20231116

20231117

PMC9866956

10.3390/v15010077

36680117