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Originally Posted by Rhettzky
Just a note too. The annual flu shot is for the most prominent strains of the virus prevelant in that year. The other method you suggest involves catching the most prominent strain of that year. So by your logic you would get sick each and every flu season, but then be immune to that particular strain for a long time. Doesn't add up.
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The reason I mentioned it and quoted the article was just for this point:
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That's why older adults may have a certain degree of protection against H1N1 — because many of them were exposed to a close cousin of this strain that circulated before 1957.
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If a hypothetical "flu shot" was available for this strain pre-1957, those that received it would have lost the degree of protection to its close cousin, the current swine flu H1N1. But those that wouldn't have gotten the shot have that "certain degree of protection".
Hypothetical situation aside, I just thought it was an interesting point. Not trying to fling mud in this pro-vax anti-vax debate.