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https://www.readbyqxmd.com/read/28640898/competition-between-influenza-a-virus-subtypes-through-heterosubtypic-immunity-modulates-re-infection-and-antibody-dynamics-in-the-mallard-duck
#1
Neus Latorre-Margalef, Justin D Brown, Alinde Fojtik, Rebecca L Poulson, Deborah Carter, Monique Franca, David E Stallknecht
Our overall hypothesis is that host population immunity directed at multiple antigens will influence the prevalence, diversity and evolution of influenza A virus (IAV) in avian populations where the vast subtype diversity is maintained. To investigate how initial infection influences the outcome of later infections with homologous or heterologous IAV subtypes and how viruses interact through host immune responses, we carried out experimental infections in mallard ducks (Anas platyrhynchos). Mallards were pre-challenged with an H3N8 low-pathogenic IAV and were divided into six groups...
June 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28636622/inhibition-of-hepatitis-b-viral-entry-by-nucleic-acid-polymers-in-heparg-cells-and-primary-human-hepatocytes
#2
Clément Guillot, Nora Martel, Françoise Berby, Isabelle Bordes, Olivier Hantz, Matthieu Blanchet, Camille Sureau, Andrew Vaillant, Isabelle Chemin
Hepatitis B virus (HBV) infection remains a major public health concern worldwide with 240 million individuals chronically infected and at risk of developing cirrhosis and hepatocellular carcinoma. Current treatments rarely cure chronic hepatitis B infection, highlighting the need for new anti-HBV drugs. Nucleic acid polymers (NAPs) are phosphorothioated oligonucleotides that have demonstrated a great potential to inhibit infection with several viruses. In chronically infected human patients, NAPs administration lead to a decline of blood HBsAg and HBV DNA and to HBsAg seroconversion, the expected signs of functional cure...
2017: PloS One
https://www.readbyqxmd.com/read/28634474/different-dynamic-distribution-in-chickens-and-ducks-of-the-hypervirulent-novel-genotype-fowl-adenovirus-serotype-4-recently-emerged-in-china
#3
Qing Pan, Yanchao Yang, Zhibin Shi, Linlin Liu, Yulong Gao, Xiaole Qi, Changjun Liu, Yanping Zhang, Hongyu Cui, Xiaomei Wang
A hypervirulent fowl adenovirus serotype 4 (FAdV-4) has caused hepatitis-hydropericardium syndrome (HHS) with mortalities that range from 30 to 80% in outbreaks across China since 2015. The FAdV-4 strain was characterized as a novel genotype based on the specific genome characteristics. However, our understanding of the dynamic distribution, tissue tropism, and pathogenesis of the novel FAdV-4 is incomplete. In this study, a new, sensitive and FAdV-4-specific real-time PCR was developed and applied to detect the dynamic distribution of the duck origin, novel FAdV-4 strain HLJDAd15 in experimentally infected special-pathogen free (SPF) chickens and ducks...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28627206/investigation-on-the-endemic-characteristics-of-metorchis-orientalisin-huainan-area-china
#4
Xiaodong Zhan, Chaopin Li, Hua Wu, Entao Sun, Yuxia Zhu
OBJECTIVE: To investigate the endemic characteristics of Metorchis orientalis (M. orientalis)in the Huainan area, Anhui province, China. METHODS: The first-intermediate host, second-intermediate host and reservoir hosts were collected, and the endemic characteristics of M. orientalis were examined through field investigation and artificial infection. RESULTS: Investigation was completed in 89 domestic ducks, 156 domestic chicken, 41 domestic geese, 20 domestic cats and 19 dogs...
June 5, 2017: Nutrición Hospitalaria: Organo Oficial de la Sociedad Española de Nutrición Parenteral y Enteral
https://www.readbyqxmd.com/read/28626158/ducks-as-a-potential-reservoir-for-pasteurella-multocida-infection-detected-using-a-new-romph-based-elisa
#5
Rongchang Liu, Cuiteng Chen, Longfei Cheng, Ronghui Lu, Guanghua Fu, Shaohua Shi, Hongmei Chen, Chunhe Wan, Jiansheng Lin, Qiuling Fu, Yu Huang
Pasteurella multocida is an important pathogen of numerous domestic poultry and wild animals and is associated with a variety of diseases including fowl cholera. The aim of this study was to develop an indirect enzyme-linked immunosorbent assay (ELISA) based on recombinant outer-membrane protein H (rOmpH) for detection of anti-P. multocida antibodies in serum to determine their prevalence in Chinese ducks. The P. multocida ompH gene was cloned into pET32a, and rOmpH was expressed in Escherichia coli BL21 (DE3)...
June 15, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28622015/the-first-whole-genome-sequence-and-pathogenicity-characterization-of-a-fowl-adenovirus-4-isolated-from-ducks-associated-with-inclusion-body-hepatitis-and-hydropericardium-syndrome
#6
Qing Pan, Linlin Liu, Yongqiang Wang, Yanping Zhang, Xiaole Qi, Changjun Liu, Yulong Gao, Xiaomei Wang, Hongyu Cui
In June 2015, an infectious disease with high prevalence causing severe hydropericardium syndrome (HPS) first appeared in duck farms of northeast China. The disease showed high morbidity of 35% and mortality of 15% in a commercial duck farm with 200,000 45-day-old ducks. One strain of hypervirulent fowl adenovirus serotype 4 was identified and designated as HLJDAd15. The whole genome of the duck isolate was sequenced and found to contain the same large deletions as a genotype that has become prevalent in chickens in China recently, indicating that this disease might be transmitted from chickens to ducks...
June 16, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28620809/single-gene-reassortment-of-highly-pathogenic-avian-influenza-a-h5n1-in-the-low-pathogenic-h9n2-backbone-and-its-impact-on-pathogenicity-and-infectivity-of-novel-reassortant-viruses
#7
Yassmin Moatasim, Ahmed Kandeil, Ahmed Mostafa, Sary Khaleel Abd Elghaffar, Rabeh El Shesheny, Ahmed Helmy M Elwahy, Mohamed Ahmed Ali
Avian influenza A H5N1 and H9N2 viruses have been extensively circulating in various avian species and frequently infect mammals, including humans. The synchronous circulation of both viruses in Egypt provides an opportunity for possible genetic assortment, posing a probable threat to global public health. To assess the potential risk of the IAV reassortants derived from co-circulation of these two AI subtypes, reverse genetics technology was used to generate a set of IAV reassortants carrying single genetic segments of clade 2...
June 15, 2017: Archives of Virology
https://www.readbyqxmd.com/read/28620271/glutamine-ameliorates-mucosal-damage-caused-by-immune-responses-to-duck-plague-virus
#8
Yuanyuan Zhang, Lili Zhao, Yan Zhou, Chenxi Diao, Lingxia Han, Niu Yinjie, Shengwang Liu, Hongyan Chen
The immune-releasing effects of L-glutamine (Gln) supplementation in duck plague virus (DPV)-infected ducklings were evaluated in 120 seven-day-old ducklings that were divided into 8 groups. The ducklings in control and DPV, 0.5Gln and DPV + 0.5Gln, 1.0Gln and DPV + 1.0Gln, and 2.0Gln and DPV + 2.0Gln received 0, 0.5, 1.0, and 2.0 g of Gln/kg feed/d by gastric perfusion, respectively. Then, the ducklings in control to 2.0Gln were injected with 0.2 mL of phosphate-buffered saline, while those in DPV to DPV + 2...
April 2017: Dose-response: a Publication of International Hormesis Society
https://www.readbyqxmd.com/read/28619174/experimental-infection-with-highly-pathogenic-h5n8-avian-influenza-viruses-in-the-mandarin-duck-aix-galericulata-and-domestic-pigeon-columba-livia-domestica
#9
Jung-Hoon Kwon, Yun Kyung Noh, Dong-Hun Lee, Seong-Su Yuk, Tseren-Ochir Erdene-Ochir, Jin-Yong Noh, Woo-Tack Hong, Jei-Hyun Jeong, Sol Jeong, Gyeong-Bin Gwon, Chang-Seon Song, Sang-Soep Nahm
Wild birds play a major role in the evolution, maintenance, and dissemination of highly pathogenic avian influenza viruses (HPAIV). Sub-clinical infection with HPAI in resident wild birds could be a source of dissemination of HPAIV and continuous outbreaks. In this study, the pathogenicity and infectivity of two strains of H5N8 clade 2.3.4.4 virus were evaluated in the Mandarin duck (Aix galericulata) and domestic pigeon (Columba livia domestica). None of the birds experimentally infected with H5N8 viruses showed clinical signs or mortality...
May 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28619152/the-newly-emerging-duck-origin-goose-parvovirus-in-china-exhibits-a-wide-range-of-pathogenicity-to-main-domesticated-waterfowl
#10
Shifeng Xiao, Shilong Chen, Xiaoxia Cheng, Fengqiang Lin, Shao Wang, Xiaoli Zhu, Bo Yu, Meiqing Huang, Jinxiang Wang, Nanyang Wu, Min Zheng, Shaoying Chen, Fusong Yu
Short beak and dwarfism syndrome virus (SBDSV) is a newly emerging distinct duck-origin goose parvovirus that belongs to the genus Dependovirus. Our previous studies have found that SBDSV was highly pathogenic to Cherry Valley ducklings and mule ducklings. However, little is known about its pathogenicity to other waterfowls. In the present study, the pathogenicity of SBDSV was evaluated in domesticated waterfowl including Muscovy ducklings, Sheldrake ducklings and domestic goslings. All experimentally infected birds exhibited remarkable growth retardation, anorexia and diarrhea similar to naturally infected birds...
May 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28592320/infectivity-transmission-and-pathogenicity-of-h5-highly-pathogenic-avian-influenza-clade-2-3-4-4-h5n8-and-h5n2-united-states-index-viruses-in-pekin-ducks-and-chinese-geese
#11
Mary J Pantin-Jackwood, Mar Costa-Hurtado, Kateri Bertran, Eric DeJesus, Diane Smith, David E Swayne
In late 2014, a H5N8 highly pathogenic avian influenza (HPAI) virus, clade 2.3.4.4, spread by migratory waterfowl into North America reassorting with low pathogenicity AI viruses to produce a H5N2 HPAI virus. Since domestic waterfowl are common backyard poultry frequently in contact with wild waterfowl, the infectivity, transmissibility, and pathogenicity of the United States H5 HPAI index viruses (H5N8 and H5N2) was investigated in domestic ducks and geese. Ducks infected with the viruses had an increase in body temperature but no or mild clinical signs...
June 7, 2017: Veterinary Research
https://www.readbyqxmd.com/read/28571695/influenza-viruses-production-evaluation-of-a-novel-avian-cell-line-duckcelt%C3%A2-t17
#12
Emma Petiot, Anaïs Proust, Aurélien Traversier, Laurent Durous, Frédéric Dappozze, Marianne Gras, Chantal Guillard, Jean-Marc Balloul, Manuel Rosa-Calatrava
The influenza vaccine manufacturing industry is looking for production cell lines that are easily scalable, highly permissive to multiple viruses, and more effective in term of viral productivity. One critical characteristic of such cell lines is their ability to grow in suspension, in serum free conditions and at high cell densities. Influenza virus causing severe epidemics both in human and animals is an important threat to world healthcare. The repetitive apparition of influenza pandemic outbreaks in the last 20years explains that manufacturing sector is still looking for more effective production processes to replace/supplement embryonated egg-based process...
May 29, 2017: Vaccine
https://www.readbyqxmd.com/read/28542340/no-evidence-that-migratory-geese-disperse-avian-influenza-viruses-from-breeding-to-wintering-ground
#13
Shenglai Yin, David Kleijn, Gerard J D M Müskens, Ron A M Fouchier, Josanne H Verhagen, Petr M Glazov, Yali Si, Herbert H T Prins, Willem Frederik de Boer
Low pathogenic avian influenza virus can mutate to a highly pathogenic strain that causes severe clinical signs in birds and humans. Migratory waterfowl, especially ducks, are considered the main hosts of low pathogenic avian influenza virus, but the role of geese in dispersing the virus over long-distances is still unclear. We collected throat and cloaca samples from three goose species, Bean goose (Anser fabalis), Barnacle goose (Branta leucopsis) and Greater white-fronted goose (Anser albifrons), from their breeding grounds, spring stopover sites, and wintering grounds...
2017: PloS One
https://www.readbyqxmd.com/read/28539661/the-pb2-mutation-with-lysine-at-627-enhances-the-pathogenicity-of-avian-influenza-h7n9-virus-which-belongs-to-a-non-zoonotic-lineage
#14
Weixuan Li, Horace Hok Yeung Lee, Run Feng Li, Huachen Maria Zhu, Guan Yi, Joseph Sriyal Malik Peiris, Zi Feng Yang, Chris Ka Pun Mok
A novel avian-origin influenza A (H7N9) virus emerged in China in 2013 and has caused zoonotic disease in over 1123 persons with an overall mortality around 30%. Amino acid changes at the residues 591, 627 and 701 of polymerase basic protein 2 (PB2) have been found frequently in the human H7N9 isolates but not in viruses isolated from avian species. We have recently identified a cluster of H7N9 viruses in ducks which circulated in China prior to the first recognition of zoonotic disease in 2013. These duck viruses have genetic background distinct from the zoonotic H7N9 lineage...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28530771/macrophage-migration-inhibitory-factor-levels-correlate-with-an-infection-in-trauma-patients
#15
Young Duck Cho, Sung Hyuk Choi, Jung Youn Kim, Sung Jun Park, Young Hoon Yoon, Han Jin Cho, Ji Won Yeom
BACKGROUND: The role of migration inhibitory factor (MIF) is best understood in septic shock and septic disease; however, the role of MIF in a secondary infection after trauma has not yet been completely studied. This study aimed to evaluate the role of MIF in trauma patients. METHODS: The patients in the study population were divided into two groups according to the results of their MIF levels. The initial MIF levels, trauma mechanism, revised trauma score, survival rate, length of stay (LOS) in the intensive care unit (ICU), level of leukocytes, and level of C-reactive protein (CRP) were compared between the groups...
May 2017: Ulusal Travma Ve Acil Cerrahi Dergisi, Turkish Journal of Trauma & Emergency Surgery: TJTES
https://www.readbyqxmd.com/read/28525340/detection-of-bordetella-avium-by-taqman-real-time-pcr-in-tracheal-swabs-from-wildlife-birds
#16
T Stenzel, D Pestka, B Tykałowski, M Śmiałek, A Koncicki, A Bancerz-Kisiel
Bordetella avium, the causing agent of bordetellosis, a highly contagious infection of the respiratory tract in young poultry, causes significant losses in poultry farming throughout the world. Wildlife birds can be a reservoir of various pathogens that infect farm animals. For this reason the studies were conducted to estimate the prevalence of Bordetella avium in wildlife birds in Poland. Tracheal swab samples were collected from 650 birds representing 27 species. The bacterial DNA was isolated directly from the swabs and screened for Bordetella avium by TaqMan real-time PCR...
March 28, 2017: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/28516729/proteome-analysis-of-duck-tembusu-virus-dtmuv-infected-bhk-21-cells
#17
Xin Sun, Shengyu Wang, Xian Lin, Lianzhong Zhao, Dan Zhang, Chenyang Yi, Xiaomei Sun, Huanchun Chen, Meilin Jin
Duck Tembusu virus (DTMUV) is a newly emerging pathogenic flavivirus that has caused huge economic losses to the duck industry in China since 2010. Moreover, the infection has spread rapidly, posing a potential public health concern. In this study, iTRAQ approach was firstly used to quantitatively identify differentially expressed cellular proteins in DTMUV-infected BHK-21 cells which are usually employed to produce veterinary vaccines for DTMUV, as well as other flaviviruses by serial passage. We identified 192 differentially expressed cellular proteins, including 11 upregulated and 8 downregulated proteins at 24 h postinfection (hpi), as well as 25 upregulated and 151 downregulated proteins at 48 hpi, of which TLR9, DDX3X, and DDX5 may play important roles in virus propagation...
May 17, 2017: Proteomics
https://www.readbyqxmd.com/read/28513330/the-pathogenesis-of-clade-2-3-4-4-h5-highly-pathogenic-avian-influenza-viruses-in-ruddy-duck-oxyura-jamaicensis-and-lesser-scaup-aythya-affinis
#18
Erica Spackman, Diann J Prosser, Mary J Pantin-Jackwood, Alicia M Berlin, Christopher B Stephens
Waterfowl are the natural hosts of avian influenza virus (AIV) and disseminate the virus worldwide through migration. Historically, surveillance and research efforts for AIV in waterfowl have focused on dabbling ducks. The role of diving ducks in AIV ecology has not been well characterized. In this study, we examined the relative susceptibility and pathogenicity of clade 2.3.4.4 H5 highly pathogenic (HP) AIV (HPAIV) in two species of diving ducks. Juvenile and adult Ruddy Duck (Oxyura jamaicensis) and juvenile Lesser Scaup (Aythya affinis) were intranasally inoculated with A/Northern Pintail/WA/40964/2014 H5N2 HPAIV...
May 17, 2017: Journal of Wildlife Diseases
https://www.readbyqxmd.com/read/28501472/prokaryotic-expression-of-a-codon-optimized-capsid-gene-from-duck-circovirus-and-its-application-to-an-indirect-elisa
#19
Cui Yang, Yu Xu, Renyong Jia, Pengfei Li, Lei Zhang, Mingshu Wang, Dekang Zhu, Shun Chen, Mafeng Liu, Zhongqiong Yin, Anchun Cheng
Duck circovirus (DuCV), as a causative agent of long-term immunosuppressive disease, has caused heavy damage to waterfowl breeding worldwide. In this study, the full-length Cap (capsid) gene of DuCV was expressed in Escherichia coli (E. coli) for the first time by optimizing the codons in its nuclear localization signal (NLS) regions. The recombinant protein was expressed as inclusion bodies, and the quantification of purified Cap protein could reach 0.29mgmL(-1). Moreover, an indirect ELISA method (Cap-ELISA) was established based on the recombinant Cap protein...
May 10, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/28498306/a-conserved-residue-tyrosine-y-84-in-h5n1-influenza-a-virus-ns1-regulates-ifn-signaling-responses-to-enhance-viral-infection
#20
Ben X Wang, Lianhu Wei, Lakshmi P Kotra, Earl G Brown, Eleanor N Fish
The non-structural protein, NS1, is a virulence factor encoded by influenza A viruses (IAVs). In this report, we provide evidence that the conserved residue, tyrosine (Y) 84, in a conserved putative SH2-binding domain in A/Duck/Hubei/2004/L-1 [H5N1] NS1 is critical for limiting an interferon (IFN) response to infection. A phenylalanine (F) substitution of this Y84 residue abolishes NS1-mediated downregulation of IFN-inducible STAT phosphorylation, and surface IFNAR1 expression. Recombinant IAV (rIAV) [H1N1] expressing A/Grey Heron/Hong Kong/837/2004 [H5N1] NS1-Y84F (rWSN-GH-NS1-Y84F) replicates to lower titers in human lung epithelial cells and is more susceptible to the antiviral effects of IFN-β treatment compared with rIAV expressing the intact H5N1 NS1 (rWSN-GH-NS1-wt)...
May 12, 2017: Viruses
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