Although no estimates of scfrs were available from africa and southeast asia, a disproportionate number of estimated pandemic deaths might have occurred in these regions. The 2009 h1n1 pandemic provides evidence that influenza virus of swine origin has the potential to cause epidemics in humans. Infeccion por influenza a porcina h1n1 en dos ninos sur. This work is licensed under a creative commons attribution. Erkrankungen beim menschen durch neuartiges influenzaavirus. Human infection with a triple reassortant swine influenza. Areinfluenzasentinel wochenbericht gesunde sachsen. Enfermedad exantema vesicular porcina pdf free download. Files are available under licenses specified on their description page.
Influenza porcina o gripe porcina estomatitis vesicular litiasis vesicular fiebre porcina. Several studies have shown that persons who work with swine are at increased risk of zoonotic influenza virus infection 4, 15. Swine influenza virus siv or swineorigin influenza virus soiv is any strain of the influenza family of viruses that is endemic in pigs. Recent isolation of a novel swineorigin influenza a h3n2 variant virus ah3n2v from humans in the united states has raised concern over the pandemic potential of these viruses. Swine influenza is an infection caused by any one of several types of swine influenza viruses. Pdf download the flu a guide to the influenza a virus pandemic. Besonderheiten bei infektion durch weitere influenzaviren.
The mixovirus influenzae is the agent that causes influenza, commonly called flu. Download as ppt, pdf, txt or read online from scribd. As of 2009, the known siv strains include influenza c and the subtypes of influenza a known as h1n1, h1n2, h2n1, h3n1, h3n2, and h2n3. Pdf download the flu a guide to the influenza a virus pandemic sickness h1n1. Pdf influenza a viruses iav of the orthomyxoviridae virus family cause one. Mar 06, 2012 recent isolation of a novel swineorigin influenza a h3n2 variant virus ah3n2v from humans in the united states has raised concern over the pandemic potential of these viruses. Structure of influenza viruses, connected with influenza. Till 2001, eight genome segments influenza a and b. Porcine parainfluenza virus 1 iowa state university.
All structured data from the file and property namespaces is available under the creative commons cc0 license. Some isolates of influenza a virus cause severe disease both in domestic poultry and, rarely, in humans. This has caused that the virus displays a mild disease, only severe or lethal in individuals with previous medical history. Creative commons attributionnoncommercialsharealike license.
A brief introduction to influenza a virus in swine. Transmission and pathogenesis of swineorigin 2009 ah1n1. Influenza a virus causes influenza in birds and some mammals, and is the only species of the genus alphainfluenzavirus of the virus family orthomyxoviridae. Here, we analyzed the virulence, transmissibility, and receptorbinding preference of four ah3n2v influenza viruses isolated from humans in 2009, 2010, and 2011. The genus respirovirus, to which the proposed ppiv1 belongs, contains four other recognized. Strains of all subtypes of influenza a virus have been isolated from wild birds, although disease is uncommon. Estimated global mortality associated with the first 12. It is an orthomyxovirus that contains the glycoproteins haemagglutinin and neuraminidase. Our estimate of respiratory and cardiovascular mortality associated with the 2009 pandemic influenza a h1n1 was 15 times higher than reported laboratoryconfirmed deaths. Jul 24, 2009 on 11 june 2009, the world health organization who raised the global pandemic alert level to phase 6, the pandemic phase, in response to the emergence and global spread of a novel influenza ah1n1 virus that contains a previously unseen combination of genes of swine origin. Recent reports of mild to severe influenzalike illness in humans caused by a novel swineorigin 2009 ah1n1 influenza virus underscore the need to better understand the pathogenesis and transmission of these viruses in mammals. Pdf influenza is a highly contagious acute viral infection of the respiratory tract. Pathogenesis and transmission of swine origin ah3n2v.
Due to the segmented nature of its genetic material, the influenza virus is highly mutagenic. Human infection with a triple reassortant swine influenza a. Areinfluenzasentinel wochenbericht lua sachsen freistaat. Structure of influenza viruses, connected with influenza life. Virus influenza porcina ah1n1 lo positivo, negativo y. Etiology porcine parainfluenza virus 1 ppiv1 is an enveloped, nonsegmented, singlestranded rna virus that is a proposed member of the family paramyxoviridae, subfamily paramyxovirinae. The pandemic h1n1 2009 influenza virus differs in its pathogenicity from seasonal influenza in two. Influenza a virus subtype h1n1 ah1n1 is the subtype of influenza a virus that was the most common cause of human influenza flu in 2009, and is associated with the 1918 spanish flu outbreak. Apr 15, 2010 several studies have shown that persons who work with swine are at increased risk of zoonotic influenza virus infection 4, 15. Structure of influenza virion influenza virions fig. A, b, c, and only types a and b are perceived to be clinically relevant in humans. Influenza a virus is a highly mutable virus with frequent antigenic drift and occasional antigenic shift. The genome of influenza viruses is a linear, segmented and formed by ssrna. Porcine parainfluenza virus 1 ppiv1 is an enveloped, nonsegmented, singlestranded rna virus that is a proposed member of the family paramyxoviridae, subfamily paramyxovirinae.
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