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Since January, more than 13, 000 people have died of complications from seasonal flu, according to the Centers for Disease Control and Prevention's weekly report on the causes of death in the nation.
CNN: Regular flu has killed thousands since January
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He told BBC News Online that the concept of seasonal variation in the risk of Crohn's disease had been studied on many occasions since the mid 1960s.
BBC: Seasonal variation in Crohn's risk
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Small studies in ferrets at the CDC suggest that when compared with seasonal flu, the virus appears to cause more severe disease but also seems to spread less easily.
CNN: CDC: U.S. may need 600 million swine flu vaccine doses
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This identified seasonal variations in the onset of ulcerative colitis, but not of Crohn's disease.
BBC: Seasonal variation in Crohn's risk
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"This year looks like it will be the highest-ever uptake of seasonal vaccine, " Dr. Tom Frieden, the director of the Centers for Disease Control and Prevention told reporters.
MSN: Seasonal flu vaccine could run short, CDC says
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People who have been thinking about getting a seasonal flu shot ought to act now, said Dr. William Schaffner, an infectious disease expert at Vanderbilt University in Nashville.
MSN: Seasonal flu vaccine could run short, CDC says