The tests revealed that the flu vaccine this year would help a little less than half of the people who received it. The reason for this is because the flu virus, which is Influenza A (H3N2), has mutated some.
Each time a mutation occurs, it will usually make the vaccine a little less effective. The H3N2 virus, unfortunately, will typically cause more hospitalization and deaths. It is already being seen in most states.
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Source: http://news.yahoo.com/cdc-says-flu-shots-may-less-effective-virus-001054530.html
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Graphics: Mine
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Keywords: flu, influenza A, H3N2, vaccine