The current flu season is shaping up to be the worst in four years, partly because the vaccine didn't work well against the viruses that made most people sick.
The 2007-2008 season started slowly, peaked in mid-February, and now seems to be declining. Based on adult deaths from flu and pneumonia, this is the worst since 2003-2004.
This year, the vaccine was only 44 percent effective, according to a study. It was the worst match for flu viruses since 1997-1999, when the vaccine didn't work at all against the circulating virus.
Every year, health officials make an educated guess to formulate a vaccine against three flu viruses they think will be circulating.
This year, two of the three strains were not good matches.
Dallas News April 18, 2008
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