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  • Title: First detection of co-circulation of West Nile and Usutu viruses in equids in the south-west of Tunisia.
    Author: Ben Hassine T, De Massis F, Calistri P, Savini G, BelHaj Mohamed B, Ranen A, Di Gennaro A, Sghaier S, Hammami S.
    Journal: Transbound Emerg Dis; 2014 Oct; 61(5):385-9. PubMed ID: 25065813.
    Abstract:
    In the last fifteen years, West Nile Virus (WNV) has dramatically expanded its geographic range and is now considered the most widespread arbovirus in the world. In Tunisia, West Nile Fever (WNF) outbreaks were reported in humans in 1997, 2003 and 2012. Usutu Virus (USUV), which is a 'new' emerging Flavivirus antigenically close to WNV, has never been reported in Tunisia. A serological investigation in 284 equids was conducted in 2012 in the southern west region of the country to assess the presence and prevalence of the WNV and USUV infection. Of the 284 samples tested by competitive enzyme-linked immunoassay, 129 were positive. Of these, 120 (42.3%) had WNV-specific neutralizing antibodies. The prevalence was significantly higher in areas closer to the oasis compared with that of the surrounding arid areas. Antibody titres against USUV were also reported in 10 equids. This was the first evidence of USUV circulation in Tunisia. Data recorded by this study indicate that WNV and USUV have circulated/are circulating in the region and that there is an urgent need to adapt the current surveillance programmes to this new scenario.
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