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Swine Influenza

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https://www.readbyqxmd.com/read/28523387/seroprevalence-of-economically-important-viral-pathogens-in-swine-populations-of-trinidad-and-tobago-west-indies
#1
Jamie R V Sookhoo, Arianne Brown-Jordan, Lemar Blake, Ridley B Holder, Sharon M Brookes, Stephen Essen, Christine V F Carrington, Ian H Brown, Christopher A L Oura
The objective of this study was to evaluate the seroprevalence and identify the strains of swine influenza virus (SwIV), as well as the seroprevalence of porcine parvovirus (PPV), transmissible gastroenteritis virus (TGEV), porcine reproductive and respiratory syndrome virus (PRRSV), porcine respiratory coronavirus (PRCV), porcine circovirus type 2 (PCV-2), and classical swine fever virus (CSFV) in pigs in Trinidad and Tobago (T&T). Blood samples (309) were randomly collected from pigs at farms throughout T&T...
May 18, 2017: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/28494344/pa-x-protein-contributes-to-virulence-of-triple-reassortant-h1n2-influenza-virus-by-suppressing-early-immune-responses-in-swine
#2
Guanlong Xu, Xuxiao Zhang, Qinfang Liu, Guoxia Bing, Zhe Hu, Honglei Sun, Xin Xiong, Ming Jiang, Qiming He, Yu Wang, Juan Pu, Xin Guo, Hanchun Yang, Jinhua Liu, Yipeng Sun
Previous studies have identified a functional role of PA-X for influenza viruses in mice and avian species; however, its role in swine remains unknown. Toward this, we constructed PA-X deficient virus (Sw-FS) in the background of a Triple-reassortment (TR) H1N2 swine influenza virus (SIV) to assess the impact of PA-X in viral virulence in pigs. Expression of PA-X in TR H1N2 SIV enhanced viral replication and host protein synthesis shutoff, and inhibited the mRNA levels of type I IFNs and proinflammatory cytokines in porcine cells...
May 8, 2017: Virology
https://www.readbyqxmd.com/read/28493054/the-dynamics-of-a-seir-sirc-antigenic-drift-influenza-model
#3
Fajar Adi-Kusumo
We consider the dynamics of an influenza model with antigenic drift mechanism. Antigenic drift is an antigen mutation on the skin surface of the influenza virus that do not produce a new virus strain. The mutation produces the same virus but with slightly different antigens that cannot be recognized by the immune receptors formed by the previous infection. There are some type of influenza that involve the interaction between two populations such as human and animal. In this paper, we construct an influenza model with antigenic drift mechanism on the human population that has interaction with the animal population...
May 10, 2017: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/28492063/vaccination-with-killed-but-metabolically-active-e-coli-over-expressing-hemagglutinin-elicits-neutralizing-antibodies-to-h1n1-swine-origin-influenza-a-virus
#4
Pei-Feng Liu, Yanhan Wang, Yu-Tsueng Liu, Chun-Ming Huang
There is a need for a fast and simple method for vaccine production to keep up with the pace of a rapidly spreading virus in the early phases of the influenza pandemic. The use of whole viruses produced in chicken eggs or recombinant antigens purified from various expression systems has presented considerable challenges, especially with lengthy processing times. Here, we use the killed but metabolically active (KBMA) Escherichia coli (E. coli) to harbor the hemagglutinin (HA) of swine origin influenza A (H1N1) virus (S-OIV) San Diego/01/09 (SD/H1N1-S-OIV)...
February 2017: Journal of Nature and Science
https://www.readbyqxmd.com/read/28484702/expression-dynamics-of-innate-immunity-in-influenza-virus-infected-swine
#5
María Montoya, Emanuela Foni, Alicia Solórzano, Elisabetta Razzuoli, Massimiliano Baratelli, Dania Bilato, Lorena Córdoba, Maria Angeles Martín Del Burgo, Jorge Martinez, Pamela Martinez-Orellana, Chiara Chiapponi, David S Perlin, Gustavo Del Real, Massimo Amadori
The current circulating swine influenza virus (IV) subtypes in Europe (H1N1, H1N2, and H3N2) are associated with clinical outbreaks of disease. However, we showed that pigs could be susceptible to other IV strains that are able to cross the species barrier. In this work, we extended our investigations into whether different IV strains able to cross the species barrier might give rise to different innate immune responses that could be associated with pathological lesions. For this purpose, we used the same samples collected in a previous study of ours, in which healthy pigs had been infected with a H3N2 Swine IV and four different H3N8 IV strains circulating in different animal species...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/28475122/harnessing-local-immunity-for-an-effective-universal-swine-influenza-vaccine
#6
REVIEW
Elma Tchilian, Barbara Holzer
Influenza A virus infections are a global health threat to humans and are endemic in pigs, contributing to decreased weight gain and suboptimal reproductive performance. Pigs are also a source of new viruses of mixed swine, avian, and human origin, potentially capable of initiating human pandemics. Current inactivated vaccines induce neutralising antibody against the immunising strain but rapid escape occurs through antigenic drift of the surface glycoproteins. However, it is known that prior infection provides a degree of cross-protective immunity mediated by cellular immune mechanisms directed at the more conserved internal viral proteins...
May 5, 2017: Viruses
https://www.readbyqxmd.com/read/28466053/analyzing-the-clinical-profile-of-swine-flu-influenza-a-h1n1-infection-in-central-india-a-retrospective-study
#7
Sameer Arbat, Mitesh Dave, Vinit Niranjane, Irfan Rahman, Ashok Arbat
Recently, India reported an increase in swine flu (influenza A H1N1) activity. There are limited studies on epidemiology of swine flu in Indian context. This study aims to analyze clinical and epidemiological profile of suspected swine flu cases in central India. 171 cases were included in a hospital based, observational, descriptive study conducted from December 2014 to April 2015. Demographics, clinical presentation and outcome of positive and negative cases were compared. Data was analyzed using STATA software...
March 2017: Virusdisease
https://www.readbyqxmd.com/read/28465552/a-reassortant-h9n2-influenza-virus-containing-2009-pandemic-h1n1-internal-protein-genes-acquired-enhanced-pig-to-pig-transmission-after-serial-passages-in-swine
#8
José Carlos Mancera Gracia, Silvie Van den Hoecke, Juergen A Richt, Wenjun Ma, Xavier Saelens, Kristien Van Reeth
Avian H9N2 and 2009 pandemic H1N1 (pH1N1) influenza viruses can infect pigs and humans, raising the concern that H9N2:pH1N1 reassortant viruses could emerge. Such reassortants demonstrated increased replication and transmissibility in pig, but were still inefficient when compared to pH1N1. Here, we evaluated if a reassortant virus containing the hemagglutinin and neuraminidase of A/quail/Hong Kong/G1/1997 (H9N2) in the A/California/04/2009 (pH1N1) backbone could become better adapted to pigs by serial passaging...
May 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28458917/adaptation-of-avian-influenza-virus-to-a-swine-host
#9
Vincent Bourret, Jon Lyall, Simon D W Frost, Angélique Teillaud, Catherine A Smith, Sarah Leclaire, JinQi Fu, Sylvain Gandon, Jean-Luc Guérin, Laurence S Tiley
The emergence of pathogenic RNA viruses into new hosts can have dramatic consequences for both livestock and public health. Here we characterize the viral genetic changes that were observed in a previous study which experimentally adapted a field isolate of duck influenza virus to swine respiratory cells. Both pre-existing and de novo mutations were selected during this adaptation. We compare the in vitro growth dynamics of the adapted virus with those of the original strain as well as all possible reassortants using reverse genetics...
January 2017: Virus Evolution
https://www.readbyqxmd.com/read/28434065/alternative-reverse-genetics-system-for-influenza-viruses-based-on-a-synthesized-swine-45s-rrna-promoter
#10
Kai Wang, Qi Huang, Zhiwei Yang, Kezong Qi, Hongmei Liu, Hongjun Chen
We generated an alternative reverse genetics (RG) system based on a synthesized swine 45S rRNA promoter to rescue the H3N2 subtype swine influenza virus. All eight flanking segment cassettes of A/swine/Henan/7/2010 (H3N2) were amplified with ambisense expression elements from RG plasmids. All segments were then recombined with the pHC2014 vector, which contained the synthesized swine 45S rRNA promoter (spol1) and its terminal sequence (t1) in a pcDNA3 backbone. As a result, we obtained a set of RG plasmids carrying the corresponding eight-segment cassettes...
April 22, 2017: Virus Genes
https://www.readbyqxmd.com/read/28415629/a-h1n1-pdm09-influenza-infection-vaccine-inefficiency
#11
Nehemya Friedman, Yaron Drori, Rakefet Pando, Aharona Glatman-Freedman, Hanna Sefty, Ravit Bassal, Yaniv Stein, Tamy Shohat, Ella Mendelson, Musa Hindiyeh, Michal Mandelboim
The last influenza pandemic, caused by the swine A(H1N1)pdm09 influenza virus, began in North America at 2009. Since then, the World Health Organization (WHO) recommended integration of the swine-based virus A/California/07/2009 strain in yearly vaccinations. Yet, infections with A(H1N1)pdm09 have continued in subsequent years. The reasons for this are currently unknown. During the 2015-2016 influenza season, we noted an increased prevalence of A(H1N1)pdm09 influenza virus infection in Israel. Our phylogenetic analysis indicated that the circulating A(H1N1)pdm09 strains belonged to 6B...
May 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28414053/inhibition-effects-of-novel-polyketide-compound-ppq-b-against-influenza-a-virus-replication-by-interfering-with-the-cellular-egfr-pathway
#12
Miaomiao Wang, Shuyao Wang, Wei Wang, Yi Wang, Hui Wang, Weiming Zhu
Development of anti-influenza A virus (IAV) drugs with novel targets and low toxicity is critical for preparedness against influenza outbreaks. In the current study, our results indicated that the novel polyketide compound purpurquinone B (PPQ-B) derived from acid-tolerant fungus Penicillium purpurogenum strain JS03-21 suppressed the replication of IAV in vitro with low toxicity, and may block some stages after virus adsorption. PPQ-B could inhibit H1N1 (A/Puerto Rico/8/34; PR8), H1N1 (A/California/04/2009; Cal09) and H3N2 (A/swine/Minnesota/02719/2009) virus replication in vitro, suggesting that PPQ-B possesses broad-spectrum anti-IAV activities...
April 13, 2017: Antiviral Research
https://www.readbyqxmd.com/read/28413498/dynamic-variations-of-the-peripheral-blood-immune-cell-subpopulation-in-patients-with-critical-h7n9-swine-origin-influenza-a-virus-infection-a-retrospective-small-scale-study
#13
Cheng Chen, Wei Sun, Jun Chen, Jian-An Huang
H7N9 influenza is a recently emerging infection with a high mortality rate. The aim of the present study was to investigate dynamic fluctuations of peripheral blood immune cell subgroups in patients with critical H7N9 infection. Flow cytometry was used to assess the cells in whole blood samples from 9 cases. With regard to the innate immune system, in the majority of patients, the natural killer (NK) cell counts were similar to those of monocytes, which demonstrated a gradual increase in the progression period and an early increase followed by a reduction during recovery...
April 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28405463/the-use-of-oral-fluids-to-monitor-key-pathogens-in-porcine-respiratory-disease-complex
#14
Juan Hernandez-Garcia, Nardy Robben, Damien Magnée, Thomas Eley, Ian Dennis, Sara M Kayes, Jill R Thomson, Alexander W Tucker
BACKGROUND: The usefulness of oral fluid (OF) sampling for surveillance of infections in pig populations is already accepted but its value as a tool to support investigations of porcine respiratory disease complex (PRDC) has been less well studied. This study set out to describe detection patterns of porcine reproductive and respiratory syndrome virus (PRRSV), porcine circovirus type 2 (PCV2), swine influenza virus type A (SIV) and Mycoplasma hyopneumoniae (M. hyo) among farms showing differing severity of PRDC...
2017: Porcine Health Management
https://www.readbyqxmd.com/read/28400591/pathogenicity-and-transmission-of-a-swine-influenza-a-h6n6-virus
#15
Hailiang Sun, Bryan S Kaplan, Minhui Guan, Guihong Zhang, Jianqiang Ye, Li-Ping Long, Sherry Blackmon, Chun-Kai Yang, Meng-Jung Chiang, Hang Xie, Nan Zhao, Jim Cooley, David F Smith, Ming Liao, Carol Cardona, Lei Li, George Peng Wang, Richard Webby, Xiu-Feng Wan
Subtype H6 influenza A viruses (IAVs) are commonly detected in wild birds and domestic poultry and can infect humans. In 2010, a H6N6 virus emerged in southern China, and since then, it has caused sporadic infections among swine. We show that this virus binds to α2,6-linked and α2,3-linked sialic acids. Mutations at residues 222 (alanine to valine) and 228 (glycine to serine) of the virus hemagglutinin (HA) affected its receptor-binding properties. Experiments showed that the virus has limited transmissibility between ferrets through direct contact or through inhalation of infectious aerosolized droplets...
April 12, 2017: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/28393730/fatal-swine-influenza-a-h1n1-and-mycoplasma-pneumoniae-coinfection-in-a-child
#16
K Jagadishkumar Kalenahalli, N Arun Kumar, K V Ashok Chowdary, M S Sumana
One of the most common causes of death in influenza patients is secondary bacterial pneumonia and the most common pathogens involved are Streptococcus pneumoniae, Staphylococcus aureus, and Haemophilus influenza. To diagnose co infection with bacteria in a H1N1 case can be difficult but should be strongly suspected in a child who present with influenza like illness and lower respiratory tract signs or symptoms. We report coinfection of Mycoplasma pneumoniae in swine influenza A H1N1 child who presented with extensive pneumonia and expired within 48 hours...
September 2016: Tüberküloz Ve Toraks
https://www.readbyqxmd.com/read/28384328/effect-of-serial-pig-passages-on-the-adaptation-of-an-avian-h9n2-influenza-virus-to-swine
#17
Jose Carlos Mancera Gracia, Silvie Van den Hoecke, Xavier Saelens, Kristien Van Reeth
H9N2 avian influenza viruses are endemic in poultry in Asia and the Middle East. These viruses sporadically cause dead-end infections in pigs and humans raising concerns about their potential to adapt to mammals or reassort with human or swine influenza viruses. We performed ten serial passages with an avian H9N2 virus (A/quail/Hong Kong/G1/1997) in influenza naïve pigs to assess the potential of this virus to adapt to swine. Virus replication in the entire respiratory tract and nasal virus excretion were examined after each passage and we deep sequenced viral genomic RNA of the parental and passage four H9N2 virus isolated from the nasal mucosa and lung...
2017: PloS One
https://www.readbyqxmd.com/read/28368362/sus-scrofa-mir-204-and-mir-4331-negatively-regulate-swine-h1n1-2009-influenza-a-virus-replication-by-targeting-viral-ha-and-ns-respectively
#18
Shishuo Zhang, Ruifang Wang, Huijuan Su, Biaoxiong Wang, Suolang Sizhu, Zhixin Lei, Meilin Jin, Huanchun Chen, Jiyue Cao, Hongbo Zhou
The prevalence of swine pandemic H1N1/2009 influenza A virus (SIV-H1N1/2009) in pigs has the potential to generate novel reassortant viruses, posing a great threat to human health. Cellular microRNAs (miRNAs) have been proven as promising small molecules for regulating influenza A virus replication by directly targeting viral genomic RNA. In this study, we predicted potential Sus scrofa (ssc-, swine) miRNAs targeting the genomic RNA of SIV-H1N1/2009 by RegRNA 2.0, and identified ssc-miR-204 and ssc-miR-4331 to target viral HA and NS respectively through dual-luciferase reporter assays...
April 3, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28366159/-fatal-swine-influenza-a-h1n1-and-mycoplasma-pneumoniae-coinfection-in-a-child
#19
K Jagadishkumar Kalenahalli, N Arun Kumar, K V Ashok Chowdary, M S Sumana
One of the most common causes of death in influenza patients is secondary bacterial pneumonia and the most common pathogens involved are Streptococcus pneumoniae, Staphylococcus aureus, and Haemophilus influenza. To diagnose co infection with bacteria in a H1N1 case can be difficult but should be strongly suspected in a child who present with influenza like illness and lower respiratory tract signs or symptoms. We report coinfection of Mycoplasma pneumoniae in swine influenza A H1N1 child who presented with extensive pneumonia and expired within 48 hours...
September 2016: Tüberküloz Ve Toraks
https://www.readbyqxmd.com/read/28363251/assessment-of-air-sampling-methods-and-size-distribution-of-virus-laden-aerosols-in-outbreaks-in-swine-and-poultry-farms
#20
Carmen Alonso, Peter C Raynor, Sagar Goyal, Bernard A Olson, Anna Alba, Peter R Davies, Montserrat Torremorell
Swine and poultry viruses, such as porcine reproductive and respiratory syndrome virus (PRRSV), porcine epidemic diarrhea virus (PEDV), and highly pathogenic avian influenza virus (HPAIV), are economically important pathogens that can spread via aerosols. The reliability of methods for quantifying particle-associated viruses as well as the size distribution of aerosolized particles bearing these viruses under field conditions are not well documented. We compared the performance of 2 size-differentiating air samplers in disease outbreaks that occurred in swine and poultry facilities...
March 1, 2017: Journal of Veterinary Diagnostic Investigation
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