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[quote=Anonymous][quote=Anonymous]Last year's flue vaccine's effectiveness was 18%. Why do you care so much?[/quote]

Not true. From the CDC for last year (http://www.cdc.gov/flu/about/season/flu-season-2014-2015.htm):
Laboratory analysis of circulating flu viruses this season indicates that most of the H3N2 viruses are antigenically or genetically different than the H3N2 vaccine virus. This is probably why vaccine effectiveness estimates this season show that the vaccine is not working as well as usual against H3N2 viruses. However, the vaccine should work well against about one-third of circulating H3N2 viruses and against H1N1 and influenza B viruses.

And:
Can the vaccine provide protection even if the vaccine is not a "good" match?

Yes, antibodies made in response to vaccination with one flu virus can sometimes provide protection against different but related viruses. A less than ideal match may result in reduced vaccine effectiveness against the virus that is different from what is in the vaccine, but it can still provide some protection against influenza illness.

In addition, it's important to remember that the flu vaccine contains three or four flu viruses (depending on the type of vaccine you receive) so that even when there is a less than ideal match or lower effectiveness against one virus, the vaccine may protect against the other viruses.

For these reasons, even during seasons when there is a less than ideal match, CDC continues to recommend flu vaccination for everyone 6 months and older. Vaccination is particularly important for people at high risk for serious flu complications, and their close contacts.[/quote]

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