The US Centers for Disease Control and Prevention (CDC) has reported that seasonal influenza levels are at their "worst for years" and the one problem was the lack of effectiveness of this year's flu vaccine. According the the Associated Press, cases of the disease were at their highest in February and the current season is the worst since 2003-2004.
The main problem this year has been a failure to correctly match the most prevalent strains of the flu virus. According to the AP, the selection of the three types of flu to be immunized against is "essentially an educated guess."
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