Abstract:
:Worldwide, West Nile virus (WNV) causes encephalitis in humans, horses, and birds. The Kunjin strain of WNV (WNVKUN) is endemic to northern Australia, but infections are usually asymptomatic. In 2011, an unprecedented outbreak of equine encephalitis occurred in southeastern Australia; most of the ≈900 reported cases were attributed to a newly emerged WNVKUN strain. To investigate the origins of this virus, we performed genetic analysis and in vitro and in vivo studies of 13 WNVKUN isolates collected from different regions of Australia during 1960-2012. Although no disease was recorded for 1984, 2000, or 2012, isolates collected during those years (from Victoria, Queensland, and New South Wales, respectively) exhibited levels of virulence in mice similar to that of the 2011 outbreak strain. Thus, virulent strains of WNVKUN have circulated in Australia for >30 years, and the first extensive outbreak of equine disease in Australia probably resulted from a combination of specific ecologic and epidemiologic conditions.
journal_name
Emerg Infect Disjournal_title
Emerging infectious diseasesauthors
Prow NA,Edmonds JH,Williams DT,Setoh YX,Bielefeldt-Ohmann H,Suen WW,Hobson-Peters J,van den Hurk AF,Pyke AT,Hall-Mendelin S,Northill JA,Johansen CA,Warrilow D,Wang J,Kirkland PD,Doggett S,Andrade CC,Brault AC,Khromykhdoi
10.3201/eid2208.151719subject
Has Abstractpub_date
2016-08-01 00:00:00pages
1353-62issue
8eissn
1080-6040issn
1080-6059journal_volume
22pub_type
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