Surveillance of Influenza A Viruses in Wild Birds in Slovenia from 2006 to 2010

Slavec, Brigita; Krapež, Uroš; Račnik, Jožko; Hari, Aleksandra; Wernig, Jedrt M.; Dovč, Alenka; Zadravec, Marko; Lindtner-Knific, Renata; Marhold, Cvetka; Zorman-Rojs, Olga

doi:10.1637/10175-041012-resnote.1

Cited by 14 publications

(7 citation statements)

References 28 publications

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“…The first H10 isolate, an H10N7 virus, was detected in chickens in Germany in 1949 (1,2). Since then, viruses bearing H10 HA and different neuraminidase (NA) subtypes have been widely detected in wild birds and domestic poultry around the world (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19). Moreover, an H10N4 virus caused an outbreak of a respiratory disease in mink in Sweden in 1984 (20), and more recently, several U.S. turkey workers tested seropositive for H10 influenza virus (15).…”

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confidence: 99%

Genetics, Receptor Binding, and Virulence in Mice of H10N8 Influenza Viruses Isolated from Ducks and Chickens in Live Poultry Markets in China

Deng

Shi

Wang

et al. 2015

J Virol

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bWe analyzed eight H10N8 viruses isolated from ducks and chickens in live poultry markets from 2009 to 2013 in China. These viruses showed distinct genetic diversity and formed five genotypes: the four duck isolates formed four different genotypes, whereas the four chicken viruses belong to a single genotype. The viruses bound to both human-and avian-type receptors, and four of the viruses caused 12.7% to 22.5% body weight loss in mice. Influenza viruses bearing the H10 subtype hemagglutinin (HA) have been detected in avian species across wide geographic areas. The first H10 isolate, an H10N7 virus, was detected in chickens in Germany in 1949 (1, 2). Since then, viruses bearing H10 HA and different neuraminidase (NA) subtypes have been widely detected in wild birds and domestic poultry around the world (3-19). Moreover, an H10N4 virus caused an outbreak of a respiratory disease in mink in Sweden in 1984 (20), and more recently, several U.S. turkey workers tested seropositive for H10 influenza virus (15). In March 2010, an H10N7 virus caused an outbreak on a chicken farm in Australia; after processing clinically normal birds from the farm, seven abattoir workers reported conjunctivitis and minor upper respiratory tract symptoms and H10 virus infection was detected in two of the seven workers (11). In 2013, H10N8 virus caused three human infections in China, two of which were fatal (21, 22). Although sequence information about the H10 viruses is increasing (23-26), the biologic properties of these viruses remain largely unknown.A total of eight H10N8 influenza viruses were isolated from ducks and chickens during our routine surveillance from To investigate the genetic relationships among these viruses, we sequenced the genomes of all eight viruses. The amino acid motif at the HA cleavage site of these isolates is -R-, which is a characteristic of viruses of low pathogenicity in chickens. The eight genes of the viruses showed distinct diversity, with the HA, NA, PB2, PB1, PA, NP, M, and NS genes of the eight viruses sharing 94.7 to 100, 78.4 to 99.9, 89.9 to 100, 90.1 to 100, 89.7 to 100, 90.0 to 99.9, 90.5 to 100, and 89.3 to 99.9% identity, respectively, at the nucleotide level. The HA, PA, and NS genes each formed two branches in their phylogenetic trees (Fig. 1A, E, and H), whereas the NA, PB2, PB1, and M genes formed three branches each in their phylogenetic trees (Fig. 1B, C, D, and G) and the NP gene formed four branches in its phylogenetic tree (Fig. 1F). Of note, the six internal genes of the H10N8 viruses in branch 1 were clustered with the corresponding genes of H9N2 influenza viruses (Fig. 1C to H), and the NA gene in group 1 belongs to the North American lineage (Fig. 1B).On the basis of this genomic diversity, we divided the viruses into five genotypes (Table 1). Of note, the four duck viruses belong to four different genotypes, whereas the four chicken viruses belong to a single genotype, and the eight gene segments of the CK/JX/S3581/13 virus shared 99.2% to 99.9% identity with the human H10N8 virus...

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confidence: 99%

Genetics, Receptor Binding, and Virulence in Mice of H10N8 Influenza Viruses Isolated from Ducks and Chickens in Live Poultry Markets in China

Deng

Shi

Wang

et al. 2015

J Virol

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“…These categories were cited in many studies in an attempt to detect antigens or nucleic acids of new, exotic or re-emerging pathogens (n = 13) [21,[46][47][48][49][50][51][52][53][54][55][56][57] or antibodies against them (n = 13) [20,22,33,35,46,51,53,[57][58][59][60][61][62]. Different applications of these studies were found: (i) as a permanent component of surveillance systems, as occasional complementary activity (n = 10);…”

Section: Active Surveillance Approachesmentioning

confidence: 99%

Systematic review of surveillance systems and methods for early detection of exotic, new and re-emerging diseases in animal populations

et al. 2014

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In this globalized world, the spread of new, exotic and re-emerging diseases has become one of the most important threats to animal production and public health. This systematic review analyses conventional and novel early detection methods applied to surveillance. In all, 125 scientific documents were considered for this study. Exotic (n = 49) and re-emerging (n = 27) diseases constituted the most frequently represented health threats. In addition, the majority of studies were related to zoonoses (n = 66). The approaches found in the review could be divided in surveillance modalities, both active (n = 23) and passive (n = 5); and tools and methodologies that support surveillance activities (n = 57). Combinations of surveillance modalities and tools (n = 40) were also found. Risk-based approaches were very common (n = 60), especially in the papers describing tools and methodologies (n = 50). The main applications, benefits and limitations of each approach were extracted from the papers. This information will be very useful for informing the development of tools to facilitate the design of cost-effective surveillance strategies. Thus, the current literature review provides key information about the advantages, disadvantages, limitations and potential application of methodologies for the early detection of new, exotic and re-emerging diseases.

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“…H7N7 viruses circulate widely in areas including North America (Spackman et al, 2008) and Europe (Slavec et al, 2012), as well as southern China (Lam et al, 2013), Australia (Bulach et al, 2010), and New Zealand (Bulach et al, 2010). Zoonotic transmission of H7 influenza viruses to humans has been suggested by reports of significantly elevated titers of H7-specific antibodies among poultry workers in Italy (Di Trani et al, 2012), and documented cases of human H7N7 infection in the Netherlands in 2003 and H7N9 infection in China in 2013 (Gao et al, 2013;Koopmans et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Adaptive amino acid substitutions enhance the virulence of an H7N7 avian influenza virus isolated from wild waterfowl in mice

Chen

Sun

et al. 2015

Veterinary Microbiology

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Surveillance of Influenza A Viruses in Wild Birds in Slovenia from 2006 to 2010

Cited by 14 publications

References 28 publications

Genetics, Receptor Binding, and Virulence in Mice of H10N8 Influenza Viruses Isolated from Ducks and Chickens in Live Poultry Markets in China

Genetics, Receptor Binding, and Virulence in Mice of H10N8 Influenza Viruses Isolated from Ducks and Chickens in Live Poultry Markets in China

Systematic review of surveillance systems and methods for early detection of exotic, new and re-emerging diseases in animal populations

Adaptive amino acid substitutions enhance the virulence of an H7N7 avian influenza virus isolated from wild waterfowl in mice

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