Human influenza viruses were also identified in swine in europe. It is an orthomyxovirus that contains the glycoproteins haemagglutinin and neuraminidase. Field and epidemiologic investigations external icon. The combined h1n1influenza group identified in the hospital discharge data. The virus involved in the current influenza outbreak is a new strain of the h1n1 influenza. Influenza suina influenza a virus h1n1 giant microbes. Swine flu is an influenza virus that usually affects pigs.
Influenza a h1n1, virus that is best known for causing widespread outbreaks, including epidemics and pandemics, of acute upper or lower respiratory tract infection. Influenza viruses that are normally found in swine are known as swine influenza viruses sivs. The 20092010 influenza season saw the emergence of the 2009 h1n1 influenza flu virus which caused the first influenza. Influenza, commonly known as the flu, is an infectious disease caused by an influenza virus. Pigs can also become infected with the h4n6 and h9n2 subtypes. Since then, the virus has sustained circulation among local swine herds, raising concerns about the potential for genetic evolution of the virus and possible retransmission back to humans of variants with increased virulence. The influenza a pandemic h1n1 2009 virus, initially identified in mexico and the united states in april 2009, has been reported in 2 countries.
Influenza porcina influenza h1n1 sintomas y causas. Highly sensitivity detection of labelfree h1n1 influenza a virus on. Swine influenza viruses can potentially cause infections in humans if antigenic. H1n1 influenza virus a is a common human pathogenic agent that caused serious respiratory illness and death over the past. Aug 11, 2010 the h1n1 virus that caused that pandemic is now a regular human flu virus and continues to circulate seasonally worldwide. Influenza ah1n1pdm09 virus in pigs, reunion island volume. The english language content on this website is being archived for historic and reference purposes only. During 2009, pandemic influenza ah1n1pdm09 virus affected humans on reunion island. Influenza virus structure, genome segment organization, and gene products are shown in figure 6. Because this virus is very different from current seasonal influenza viruses, many people will not have protective immunity against it and the seasonal flu vaccine will not protect against it either. Although swine origin ah1n12009 influenza virus hereafter ph1n1 has been detected in swine in 20 countries, there has been no published surveillance of the virus in african livestock. This reassortant ah1n2 virus was a classical swine ah1n1 virus that had gained the neuraminidase na from human ah3n2 viruses. Pneumonia and respiratory failure from swineorigin. In virology, the pandemic h1n109 virus is a swine origin influenza a virus subtype h1n1 strain.
Emergence of a novel swineorigin influenza a h1n1 virus in humans external icon. A preliminary estimation of the reproduction ratio for new influenza a h1n1 from the outbreak in mexico, marchapril 2009. In virology, influenza a virus subtype h1n1 ah1n1 is the subtype of influenza a virus that. Correlation of pandemic h1n1 2009 viral load with disease severity and prolonged viral shedding in children. Pneumonia and respiratory failure from swineorigin influenza.
Possible origin of current influenza a h1n1 viruses pdf. Influenza humana a h1n1, su profilaxis y tratamiento. However, just as the common, seasonal flu that affects humans is constantly mutating as our immune systems and vaccines compromise weaker strains, swine flu is always trying to improve itself so that it can become more virulent, spread faster and even associate with better company. During the spring of 2009, a novel influenza a h1n1 virus of swine origin caused human infection and acute respiratory illness in mexico. In 2009, human infection with the influenza a h1n1v virus became a health burden throughout the world. Mar 18, 2010 correlation of pandemic h1n1 2009 viral load with disease severity and prolonged viral shedding in children.
Correlation of pandemic h1n1 2009 viral load with disease. Association of influenzalike illness activity with hospitalizations for heart failure. Can this new influenza a h1n1 virus be transmitted to humans by eating pork and pork products. The influenza a pandemic h1n1 2009 virus, initially identified in mexico. Evolution of therapeutic antibodies, influenza virus. Evolution of therapeutic antibodies, influenza virus biology. 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 a h1n1 virus that contains a previously unseen combination of genes of swine origin. Background in late march 2009, an outbreak of a respiratory illness later proved to be caused by novel swineorigin influenza a h1n1 virus soiv was identified in mexico. Learning from the 2009 h1n1 influenza pandemic the new rms.
Diabetes and the severity of pandemic influenza a h1n1 infection. Mar 26, 2010 these images provide a 3d graphical representation of the biology and structure of a generic influenza virus, and are not specific to the 2009 h1n1 virus. The impact of the pandemic influenza a h1n1 2009 virus on seasonal influenza a viruses in the southern hemisphere, 2009. To access free multiple choice questions on this topic, click here. It was called swine flu early on because tests showed that it was like flu viruses that occur in swine pigs. The 2009 h1n1 influenza virus became wellestablished in large numbers of. Background the majority of influenza transmission occurs in homes, schools and workplaces, where many frequently touched communal items are situated. The clinical spectrum of disease caused by the swineorigin 2009 ah1n1 influenza virus and its transmissibility are not completely understood. Clinical aspects of pandemic 2009 influenza a h1n1 virus. These images provide a 3d graphical representation of the biology and structure of a generic influenza virus, and are not specific to the 2009 h1n1 virus. H1n1 influenza swine flu statpearls ncbi bookshelf. The known siv strains include influenza c and the subtypes of influenza a known as h1n1, h1n2, h3n1, h3n2 and h2n3. The combined h1n1influenza group identified in the hospital discharge data represents about 6,500 more cases 75% more than the labconfirmed cases reported to phac. Viral gene sequences to assist update diagnostics for swine influenza ah1n1 pdf.
In virology, influenza a virus subtype h1n1 a h1n1 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. Pandemic ah1n12009 influenza virus in swine, cameroon, 2010. However, localized outbreaks of various magnitudes are likely to continue. The pandemic influenza a h1n1 2009 virus was confirmed in all deceased patients. The english language content on this website is being archived for. The impact of the pandemic influenza ah1n1 2009 virus on seasonal influenza a viruses in the southern hemisphere, 2009. We therefore measured the viability over time of two h1n1 influenza strains applied to a variety of. Pdf influenza is a highly contagious acute viral infection of the respiratory tract. The influenza a h1n1 virus is a member of the family orthomyxoviridae a group of rna viruses. Interim guidance on specimen collection and processing for patients with suspected swine influenza a h1n1 virus infection. Chapitre 7 grippe infection par le virus influenza. For current, updated information on seasonal flu, including information about h1n1, see the cdc seasonal flu website.
The first outbreak occurred in 2009 and infected people all over the world. Emergence of a novel swineorigin influenza a h1n1 virus in humans laboratory supplemental pdf icon 4. The 20092010 influenza season saw the emergence of the 2009 h1n1 influenza flu virus which caused the first influenza pandemic global outbreak of disease caused by a new flu virus in more than 40 years. The impact of the h1n1 pandemic on canadian hospitals. H1n1 swine flu is a subtype of influenza a virus a communicable viral. The h1n1 virus that caused that pandemic is now a regular human flu virus and continues to circulate seasonally worldwide. Influenza d virus infects animals including cattle and pigs as well as humans as shown by the presence of serum antibodies to the virus but human case has not been reported 2. Free chlorine levels typically used in drinking water or recreational water. Swine influenza also known as swine flu or pig flu is a respiratory disease that occurs in pigs that is caused by the influenza a virus. Pdf the h1n1 influenza a, also known as swine flu, has caused.
155 368 308 588 333 275 1607 627 714 867 434 1162 449 1274 1425 168 358 494 408 1486 711 1529 553 446 988 331 1216 316 563 1641 252 403 282 418 993 1307 1025 926 230 1435 1260 653 698 283 107