No response to swine influenza virus vaccine
Posted on May 1, 2009
Filed Under H1N1 Causes | Leave a Comment
World Health Organization, Mexico and the United States have a high degree of concern about a swine influenza virus appeared. Margaret Chan, a conference call with the media, said the current swine influenza in serious condition, the outbreak quickly recognize the lack of knowledge of the virus, does not rule out the H1N1 swine influenza viruses such as H5N1 avian influenza virus and SARS-like, become a global pandemic virus .
Swine influenza is caused by the influenza virus type A pig classes of common respiratory disease, with strong pathogenicity, but the resulting mortality rate caused by very low (1-4%). The same with the human influenza virus, the virus spread in pigs year-round, high-fat period of autumn and winter.
Scientists in 1930 from a disease-causing pigs to detect and isolate the first cases of classic swine influenza virus, which is now well-known A Tribe H1N1 virus. H1N1, H1N2, H3N2, and H3N1 viruses A subtype H1N1 virus family, are spread in pigs.
Because influenza viruses are cross-species transmission characteristics, herd will be infected with avian influenza and human seasonal influenza, such as the H3N2 swine influenza virus was initially spread from human to pigs of. Similarly, influenza viruses cross species also cause human infections of swine influenza viruses.
Of human infection with swine influenza virus, symptoms similar to ordinary flu, fever, cough, runny nose, whole body weakness, loss of appetite and other symptoms, but the severity was very different, and some patients have no discomfort, some are enough to death . In patients with mild symptoms are often mistaken for seasonal flu, which makes early for the study of human suffering from swine influenza hysteresis foot forward.
At present, there is no developed vaccine against swine influenza viruses. As the H1N1 swine influenza virus is different from the H1N1 human influenza virus, therefore, the current flu vaccine does not prevent H1N1 swine influenza viruses.
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