Higher H1N1 flu risk after receiving seasonal flu vaccine - page 2

i went to a canadian news link posted on another site, and saw the following article: (two and a half weeks after i had the seasonal flu vaccine, i got the flu, which seems to validate the... Read More

  1. by   Purple_Scrubs
    Quote from lamazeteacher
    Please expand your comment. I'm interested in knowing how you formed your conclusion. (sort of like asking you to show your math calculations - joke)
    The study (if it is validated, which I doubt it will be) can only show that there is a correlation between people having had the seasonal flu shot and having a higher risk of getting H1N1. Many people assume that this means that having the seasonal flu shot caused the higher risk of H1N1. In reality, there are too many variables to determine causation. I am more apt to believe, like Morte, that the people who opted to take the seasonal flu shot last year were those who were already at higher risk for seasonal flu, and thus already at higher risk for the H1N1.

    One other possibility is that the people who elect to get the seasonal flu shot are more health conscious, thus more apt to seek medical attention for flu s/s and then to demand h1n1 testing. This could make it appear that that group gets it more often, when in reality many many more people are getting sick with h1n1 but treating the mild cases at home, and many of those who do seek medical attention are not being tested for the virus.

    I could think of many other reasons that would show correlation between having the seasonal flu shot and risk for h1n1, but scientifically I cannot see how having the seasonal flu shot can cause a higher risk for h1n1. Like I said, I just don't buy it. Until they can identify the reason for a supposed causation, I assume it to be correlation related to unidentified factors.
    Last edit by Purple_Scrubs on Oct 30, '09 : Reason: clarification
  2. by   Laidback Al
    Quote from lamazeteacher
    "We are still waiting for the public release of the data." quote from post#9

    What data, Laidback Al?

    The study in Canada didn't involve data regarding who got seasonal flu vaccine prior to this year......
    To clarify, the article is apparently being peer-reviewed and has not yet be published. Presumably the conclusions drawn by the researchers are based on some kind of data and analysis of that data. I would be interested in seeing the data and determining for myself whether or not the correlations are statistically supported.

    And, like Purple_Scrubs, I would like to see the evidence for causation. What would be the scientific explanation that an influenza vaccination would make you more susceptible to H1N1 infection. If that were generally true, then the more people that get flu vaccinations, the more flu infections we should see every season. That obviously doesn't happen.