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H1N1 vs Seasonal Flu

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  • H1N1 vs Seasonal Flu

    Hello all!!

    I am compiling a report on the differences between H1N1 and Seasonal flu. I would appreciate any and all links, clinical research or info related to this topic to help get the info to present to the county where I reside who seem to believe there is no or limited differences between H1N1 and seasonal strain.

    But Prince Prospero was happy and dauntless and sagacious. -Poe

    Also known as CRH-land

  • #2
    Re: H1N1 vs Seasonal Flu

    The CDC chart of symptoms of hospitalized H1N1 cases is the only real breakdown of symptoms I've seen - it's on this page (scroll down until you're almost at the bottom):

    I'd really like to see a similar chart, but showing the breakdown of symptoms by percentage in MILD cases instead of hospitalized cases. I don't know of anything like that being available yet.


    • #3
      Re: H1N1 vs Seasonal Flu

      Thanks Somebodyoutthere!! I also found this:

      How Does Seasonal Flu Differ From Pandemic Flu?
      Seasonal Flu
      Pandemic Flu

      Outbreaks follow predictable seasonal patterns; occurs annually, usually in winter, in temperate climates
      Occurs rarely (three times in 20th century - last in 1968)

      Usually some immunity built up from previous exposure
      No previous exposure; little or no pre-existing immunity

      Healthy adults usually not at risk for serious complications; the very young, the elderly and those with certain underlying health conditions at increased risk for serious complications
      Healthy people may be at increased risk for serious complications

      Health systems can usually meet public and patient needs
      Health systems may be overwhelmed

      Vaccine developed based on known flu strains and available for annual flu season
      Vaccine probably would not be available in the early stages of a pandemic

      Adequate supplies of antivirals are usually available
      Effective antivirals may be in limited supply

      Average U.S. deaths approximately 36,000/yr
      Number of deaths could be quite high (e.g., U.S. 1918 death toll approximately 675,000)

      Symptoms: fever, cough, runny nose, muscle pain. Deaths often caused by complications, such as pneumonia.
      Symptoms may be more severe and complications more frequent

      Generally causes modest impact on society (e.g., some school closing, encouragement of people who are sick to stay home)
      May cause major impact on society (e.g. widespread restrictions on travel, closings of schools and businesses, cancellation of large public gatherings)

      Manageable impact on domestic and world economy
      Potential for severe impact on domestic and world economy

      For additional information on seasonal flu visit:

      CDC’s pandemic preparedness efforts include ongoing surveillance of human and animal influenza viruses, risk assessments of influenza viruses with pandemic potential.
      But Prince Prospero was happy and dauntless and sagacious. -Poe

      Also known as CRH-land


      • #4
        Re: H1N1 vs Seasonal Flu

        Also keeping in mind the GI tract issues and many not presenting fever, here is some more info--BUT can anyone provide me with anymore??

        Why Swine Flu Differs From Seasonal Flu
        07.02.09, 02:00 PM EDT

        Pandemic virus affects lungs and stomach, whereas seasonal flu doesn't, researchers say

        THURSDAY, July 2 (HealthDay News) -- Scientists have uncovered some intriguing clues about why the new swine flu frequently brings on gastrointestinal distress and vomiting, symptoms not usually associated with seasonal flu.

        In experiments with ferrets, research teams in the United States and the Netherlands found that the new H1N1 flu virus replicated more extensively in the respiratory tract, going to the lungs, whereas the seasonal flu virus stayed in the animals' nasal cavity. The U.S. team also found that the new virus, unlike the seasonal one, went into the ferrets' intestinal tract.

        Such distinctions, the U.S. researchers said, can make a difference in establishing appropriate public health responses as the pandemic continues around the world, so far sickening more than a million people in the United States alone.

        "Findings from the study demonstrate that, in ferrets, the novel 2009 H1N1 influenza virus leads to increased morbidity and increased respiratory disease when compared to contemporary seasonal human influenza viruses," said researcher Terrence M. Tumpey, a senior microbiologist in the influenza branch of the U.S. Centers for Disease Control and Prevention in Atlanta.

        "Additionally, virus transmission was less effective in ferrets infected intranasally with novel 2009 H1N1 influenza virus, compared to those infected with contemporary seasonal human influenza viruses," he added.

        The reports are published in the July 2 online edition of Science.

        When both teams looked at how easily the new H1N1 virus can be transmitted, they came to different conclusions, however.

        The Dutch researchers found that the new H1N1 virus and the seasonal flu virus were equally good in infecting the animals.

        But Tumpey's team found that the swine flu virus might not be transmitted as easily as the seasonal flu virus. "The novel 2009 H1N1 influenza viruses exhibited less efficient respiratory droplet transmission in ferrets, in comparison to the high-transmissibility of a seasonal H1N1 virus," he said.

        Ferrets are used to study influenza because the flu virus affects them in a similar way to humans, the researchers noted.

        "One thing we know for sure about influenza viruses is that they are unpredictable," Tumpey added. "The characteristics that the virus is displaying today might not hold true in the upcoming months."

        It is important to remember, he said, that this is a new influenza virus never seen in humans before April 2009.

        "The virus does not appear to be fully adapted to its new human host," Tumpey said. "How the virus may adapt further as it circulates among people is not known. However, this uncertainty makes it imperative that the virus and the epidemiology of the outbreak be closely monitored."

        Dr. Pascal James Imperato, dean of the School of Public Health at SUNY Downstate Medical Center in New York City, found the new research added key information to what was already known.

        "In this study, it was found that the 2009 H1N1 virus was less efficiently transmitted by droplet infection in ferrets compared to the seasonal human H1N1 virus," Imperato said. "This is a significant finding as it indicates that the 2009 swine flu virus might not be as easily transmitted between humans as its seasonal counterpart."

        On the other hand, he added, the findings also "collectively demonstrate that it has the potential to cause serious clinical illness that also results in gastrointestinal symptoms, which were, in fact, observed in a number of patients."

        On June 11, the World Health Organization declared the first flu pandemic since 1968, triggered by the rapid spread of the H1N1 swine flu virus across North America, Australia, South America, Europe and regions beyond. Two weeks ago, U.S. health officials said they were considering a swine flu immunization campaign that could involve an unprecedented 600 million doses of vaccine.

        That would dwarf the 115 million vaccine doses given annually for seasonal flu.

        But Prince Prospero was happy and dauntless and sagacious. -Poe

        Also known as CRH-land