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The 2009 swine flu pandemic, caused by the H1N1/swine flu/influenza virus and declared by the World Health Organization (WHO) from June 2009 to August 2010, was the third recent flu pandemic involving the H1N1 virus (the first being the 1918–1920 Spanish flu pandemic and the second being the 1977 Russian flu ).
- Where Did The 2009 H1N1 Flu Virus Come from?
- Why Does CDC Think this?
- Have Viruses Similar to The 2009 H1N1 Virus Been Seen before?
- Was The 2009 H1N1 Flu Virus Created in A Laboratory?
- How Often Does Reassortment of Influenza Viruses occur?
- What Scientific Studies Are Available For Additional Information?
The 2009 H1N1 influenza virus (referred to as “swine flu” early on) was first detected in people in the United States in April 2009. This virus was originally referred to as “swine flu” because laboratory testing showed that its gene segments were similar to influenza viruses that were most recently identified in and known to circulate among pigs. ...
There are three primary reasons why experts from CDC and other public health research institutions around the world think 2009 H1N1 influenza resulted from reassortment of influenza viruses that occur naturally among pigs.
Prior to the discovery of the 2009 H1N1 influenza virus, this particular combination of gene segments from North American and Eurasian swine had never been detected before in a single influenza virus and this new virus is different from the influenza viruses that normally circulate in North American and Eurasian pigs. It is not known when reassortm...
This is very unlikely. Each of the gene segments within the 2009 H1N1 influenza virus have been found in pigs for more than 10 years prior to the beginning of the 2009 H1N1 influenza outbreak.2 Pigs have long been considered a possible mixing vessel for influenza viruses that originate within pigs, birds and humans. In addition, a 2009 Nature study...
We know that reassortment occurs frequently in nature. Fortunately, reassortment rarely results in a virus with pandemic potential, though it has done so at least twice in the 20th century. The influenza viruses that caused the 1957 and 1968 pandemics contained a mixture of gene segments from human and avian influenza viruses. What is clear from ge...
“Antigenic and Genetic Characteristics of the Early Isolates of Swine-Origin 2009 A (H1N1) Influenza Viruses Circulating in Humans” by Rebecca J. Garten & C. Todd Davis et al. Science. 325: no. 593...“Origins and evolutionary genomics of the 2009 swine-origin H1N1 influenza A epidemic” by Gavin J.D. Smith et al. Nature. 459, 1122-1125. (25 June 2009).Jun 11, 2019 · In the spring of 2009, a novel influenza A (H1N1) virus emerged. It was detected first in the United States and spread quickly across the United States and the world. This new H1N1 virus contained a unique combination of influenza genes not previously identified in animals or people. This virus was designated as influenza A (H1N1)pdm09 virus.
Mar 23, 2023 · The H1N1 flu, sometimes called swine flu, is a type of influenza A virus. During the 2009-10 flu season, a new H1N1 virus began causing illness in humans. It was often called swine flu and was a new combination of influenza viruses that infect pigs, birds and humans.
Apr 15, 2024 · Date: 2009. influenza pandemic (H1N1) of 2009, the first major influenza outbreak in the 21st century, noted for its rapid global spread, which was facilitated by an unusually high degree of viral contagiousness. Global dissemination of the virus was further expedited by the unprecedented rates of passenger travel that characterize the modern era.
- Kara Rogers
2009 swine flu pandemic in the United States. The 2009 flu pandemic in the United States was caused by a novel strain of the Influenza A/H1N1 virus, commonly referred to as " swine flu ", that was first detected on 15 April 2009. [114] While the 2009 H1N1 virus strain was commonly referred to as "swine flu", there is no evidence that it is ...
Jun 16, 2010 · The cases of 2009 H1N1 flu in California occurred in the context of sporadic reports of human infection with North American-lineage swine influenza viruses in the United States, most often associated with close contact with infected pigs. (During December 2005 – January 2009, 12 cases of human infection with swine influenza were reported ...
