Publications

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avian influenza surveillance in hunter-harvested waterfowl from the gulf coast of texas (november 2005-january 2006).the objectives of our study were to determine prevalence of avian influenza viruses (aiv) on wintering grounds on the texas gulf coast, usa, and to compare real-time reverse-transcriptase polymerase chain reaction (rrt-pcr) and virus isolation for detection of aiv in cloacal swabs from wild waterfowl. cloacal swabs were collected from hunter-harvested waterfowl from november 2005 to january 2006 at four wildlife management areas. seven aiv were isolated from four species of ducks: green-winged t ...200818436675
characterization of h5n1 influenza a viruses isolated from domestic green-winged teal.two avian influenza virus strains, a/domestic green-winged teal/hunan/67/2005 (h5n1) (d-gwt/67) and a/domestic green-winged teal/hunan/79/2005 (h5n1) (d-gwt/79), were isolated from healthy domestic green-winged teals (anas crecca) in hunan province, south china. genomic analysis showed that both isolates were reassortants. the hemagglutinin (ha) genes of the two isolates were closely related to that of an h5n1 strain isolated from tree sparrow (a/tree sparrow/henan/1/04). the neuraminidase (na) ...200918825495
novel h5 clade 2.3.4.4 reassortant (h5n1) virus from a green-winged teal in washington, usa.eurasian (ea)-origin h5n8 clade 2.3.4.4 avian influenza viruses were first detected in north america during december 2014. subsequent reassortment with north american (am) low-pathogenic wild-bird-origin avian influenza has generated at least two reassortants, including an ea/am h5n1 from an apparently healthy wild green-winged teal, suggesting continued ongoing reassortment.201525838478
genetic characterization of a rare h12n3 avian influenza virus isolated from a green-winged teal in japan.this study reports on the genetic characterization of an avian influenza virus, subtype h12n3, isolated from an eurasian green-winged teal (anas crecca) in japan in 2009. the entire genome sequence of the isolate was analyzed, and phylogenetic analyses were conducted to characterize the evolutionary history of the isolate. phylogenetic analysis of the hemagglutinin and neuraminidase genes indicated that the virus belonged to the eurasian-like avian lineage. molecular dating indicated that this h ...201525557930
avian influenza viruses from migratory and resident ducks of coastal louisiana.cloacal and tracheal swabs were collected from 1389 hunter-killed ducks in cameron parish, louisiana, during the 1986 and 1987 waterfowl seasons. twenty-eight avian influenza viruses (aivs) were isolated from 605 blue-winged teal (anas discors), 75 mottled ducks (a. fulvigula), 375 gadwalls (a. stepera) and 334 green-winged teal (a. crecca). prevalence estimates of aiv in ducks sampled during september, november, and december through january were 3.1%, 2.0%, and 0.4%, respectively. differences i ...19902369380
mx gene diversity and influenza association among five wild dabbling duck species (anas spp.) in alaska.mx (myxovirus-resistant) proteins are induced by interferon and inhibit viral replication as part of the innate immune response to viral infection in many vertebrates. influenza a virus appears to be especially susceptible to mx antiviral effects. we characterized exon 13 and the 3' utr of the mx gene in wild ducks, the natural reservoir of influenza virus and explored its potential relevance to influenza infection. we observed a wide range of intra- and interspecies variations. total nucleotide ...201020621205
genetic characterization of highly pathogenic avian influenza a h5n8 viruses isolated from wild birds in egypt.a newly emerged h5n8 influenza virus was isolated from green-winged teal in egypt during december 2016. in this study, we provide a detailed characterization of full genomes of egyptian h5n8 viruses and some virological features. genetic analysis demonstrated that the egyptian h5n8 viruses are highly pathogenic avian influenza viruses. phylogenetic analysis revealed that the genome of the egyptian h5n8 viruses was related to recently characterized reassortant h5n8 viruses of clade 2.3.4.4 isolat ...201728721841
avian influenza virus prevalence in migratory waterfowl in the united states, 2007-2009.we analyzed 155,535 samples collected for surveillance of avian influenza viruses (aivs), in the united states from 2007 to 2009, from migratory waterfowl (ducks, geese, and swans). the goal was to elucidate patterns of prevalence by flyway and functional groups to determine targets for future surveillance. apparent prevalence of aiv was highest in the pacific flyway in 2007-2008 (14.2% and 14.1%, respectively), in the mississippi flyway in 2009 (16.8%), and lowest each year in the atlantic flyw ...201425618997
surveillance of avian influenza viruses in migratory birds in egypt, 2003-09.migratory (particularly aquatic) birds are the major natural reservoirs for type a influenza viruses. however, their role in transmitting highly pathogenic avian influenza (hpai) viruses is unclear. egypt is a "funnel" zone of wild bird migration pathways from central asia and europe to eastern and central africa ending in south africa. we sought to detect and isolate avian influenza viruses in migratory birds in egypt. during september 2003-february 2009, the us naval medical research unit numb ...201222740532
complete genome sequence of a novel reassortant h3n6 avian influenza virus isolated from domestic green-winged teal.an avian influenza virus strain, a/domestic green-winged teal/hunan/2036/2007(h3n6) (dgw-t2036), was isolated from healthy domestic green-winged teals (anas crecca) in hunan province, south china. all eight gene segments of the isolate were sequenced. genomic analysis demonstrated that this h3n6 virus is a novel reassortant avian influenza virus with a gene constellation originating from multiple ancestors.201323682150
identification of type a influenza viruses from wild birds on the delmarva peninsula, 2007-10.wild waterfowl and shorebirds in the delaware-maryland-virginia (delmarva) peninsula region within the atlantic flyway were sampled as part of the early detection of highly pathogenic h5n1 avian influenza (ai) in wild migratory birds program. the u.s. department of agriculture (usda) and state wildlife agencies submitted 7858 samples for ai virus (aiv) testing by real-time reverse transcription pcr (rrt-pcr) to the university of delaware poultry health system from april 2007 to march 2011. virus ...201728301233
genome sequence of a reassortant h5n1 avian influenza virus isolated from domestic green-winged teal.an avian influenza virus strain, a/domestic green-winged teal/hunan/3450/2006(h5n1) (dgw-t3450), was isolated from domestic green-winged teals. genome analysis demonstrated that dgw-t3450 is a novel reassortant strain. the hemagglutinin (ha) and neuraminidase (na) genes of this strain originated from h5n1 viruses circulating in poultry, while its remaining genes are derived from multiple ancestors, including viruses like those that infect wild birds.201323950136
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