H1N1 incubation period after exposure
Posted on November 6, 2009
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Infectious period and the incubation period
Available information indicates that people infected with influenza A H1N1 influenza virus, the infectious period is 1 day prior to the onset to 7 days after onset. If the case is still 7 days after fever onset that is still contagious. Children, especially children’s infectious period may be longer than 7 days. People are infected with Influenza A H1N1 influenza incubation period is usually about 1-7 days, compared with influenza, avian flu a long incubation period.
Susceptible population and the high-risk populations
Generally susceptible. Most patients aged 25 to 45 years old, is currently reported to mainly young adults should pay attention to the elderly and children.
Engaged in pig farming industry, in within 1 week prior to the onset been pig, sales and slaughter of those other places, and exposure to swine influenza virus infection in laboratory workers of materials for at-risk populations.
People are infected with influenza A H1N1 influenza usually occur in winter and spring seasons, pigs infected with influenza A H1N1 influenza generally occurs in summer and autumn.
Influenza A H1N1 influenza diagnostic criteria
■ medical observation have been to Influenza A H1N1 influenza cases in affected areas, or pigs, and H1N1 Influenza A history of close contact with influenza patients, within 1 week there were clinical manifestations of influenza. Were classified as cases of medical observation and to carry out seven days under medical observation (based on disease can be at home or hospital isolation).
■ suspected cases have been to affected areas, or pigs, and H1N1 Influenza A history of close contact with influenza patients (also available epidemiological history unknown), 1 week clinical manifestations of influenza, respiratory secretions, pharyngeal try son, sputum fluid, serum H subtype virus antibody-positive or nucleic acid testing positive.
■ clinically diagnosed cases were diagnosed as suspected cases, and with a common history of exposure of people who have been diagnosed as confirmed cases.
■ confirmed cases from the respiratory tract specimens or serum isolated to a specific virus; RT-PCR on these specimens, there is influenza A H1N1 influenza virus RNA presence, after sequencing confirmed or two four-fold increase in serum antibody titers can be diagnosed was infected with Influenza A H1N1 influenza.
Related links the history of an outbreak of influenza A
■ In 1976, the United States so-called “New Jersey” incident, about 500 people infected with influenza A H1N1 subtype of influenza virus, the virus and then isolated the virus from pigs in vivo the same as the first time that in natural conditions, alpha – H1N1 influenza virus can be transmitted to humans from pigs.
■ 1999 Nian 10 months, Hong Kong, a 10-month-old baby girl infected with the influenza A H3N2 influenza virus, now fully recovered. Over the years, all over the world people are infected with swine influenza viruses of different virus strains reported, but no large-scale epidemic. Recently, some parts of Mexico and the United States and other outbreaks of human infection with influenza H1N1 influenza outbreak. World Health Organization, pointed out that the cases of Mexico and the United States infected with influenza A H1N1 influenza virus belongs to a different strain.
Case-fatality rate lower than the SARS and bird flu
For the outbreak of human infection with H1N1 influenza pandemic influenza epidemic intensity and mortality rate, the Chinese Center for Disease Control virus diseases Reid, director of the new stress that people infected with influenza A H1N1 influenza virus and the SARS epidemic would certainly exceed the intensity of human avian flu, But the case-fatality rate no faster than SARS and human avian influenza.
“We are a race with the virus.” Yang Wei, deputy director of Chinese Center for Disease Control, said people a sense of Influenza A H1N1 swine influenza virus, the risk of spread to China is very large, China’s many departments have mobilized to contain the virus But objectively speaking, there is a great difficulty, first, that the virus spreads through the air, and second, patients infected with the virus, no disease can be prior to detoxification, or already has a contagious.
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