(www.picornaviridae.com, Adams et al., 2017). Human parechoviruses are important pathogens in humans especially in infants and young children and are associated with a wide spectrum and severity of diseases (Harvala et al., 2010). Ljungan and Sebokele viruses are thought to be rodent-borne viruses. Ljungan virus was first isolated from bank voles in Sweden (Niklasson & Le Duc, 1984) and it has been suggested to be the zoonotic etiological agent of myocarditis, type-1 diabetes mellitus and possibly other human diseases (Niklasson et al., 1998; Niklasson et al., 2007). Sebokele virus was originally isolated in 1972 fromAfrican wood mice (Digoutte and Germain, 1985; Joffret et al., 2013). Recently, Ljungan virus was also detected in wild birds, in gull species in Japan (Mitake et al., 2016).In general, picornaviruses are small, non-enveloped viruses with single-stranded, positive-sense, 7.2-10.1 kb-long polyadenylated genomic RNA. Picornaviral genomes have a common organization pattern: viral polyprotein coding single open reading frame (ORF) (except for the genus Dicipivirus which has two ORFs separated by an untranslated region) is flanked by the highly structured 5′ and 3′ untranslated regions (UTRs) (Knowles et al., 2012).The picornavirus genomes consist of essential secondary RNA structures functioning as a cisacting RNA sequences e.g. internal ribosomal entry site (IRES) (Martínez-Salas et al., 2015) and cis-acting replication element (cre) (Tolf et al., 2009). Generally, the viral polyprotein (VP) processed to form three or four capsid monomer proteins (VP0-VP3-VP1 or VP4-VP2-VP3-VP1), and at least seven non-structural proteins: 2A-2B-2C-3A-3B-3C-3D; however, differences occur in picornaviruses of different genera. The numbers of the cleaved individual
ACCEPTED MANUSCRIPTA C C E P T E D M A N U S C R I P T Birds are well known reservoirs of numerous viral pathogens such as avian influenza virus, West Nile virus and Japanese encephalitis virus in humans (Reed et al., 2003).However, compared to the ten thousands of known bird species, rather few picornaviruses have been described from avian sources, often from faecal samples, and most of these have been identified in the last decade from domestic birds (Boros et al., 2013; Boros et al., 2014b). Birds have the potential also to serve as powerful biomonitors and can be used to survey for factors that may pose both public and wildlife health concerns (Pollack et al., 2017).In this study, a novel member of the genus Parechovirus was detected and characterized from faecal samples of birds of prey, a picornavirus related to Ljungan and Sebokele viruses.
Materials and MethodsIn June 2014, faecal samples were collected from wild birds of prey, from 11 common kestrels (Falco tinnunculus) and 7 red-footed falcons (F. vespertinus) from Gara (46°03 '28.77"N 19°02'38.50"E) and Kardoskút (46°50'43.30"N 20°64'32.92"E) (Phan et al., 2013). Viral-particle protected nucleic acids were extracted using QIAamp spin-column technique (Qiagen) and subjected to a viral metage...