(NBC News) – The school closed on Friday for children in at least one district in Michigan, allegedly because too many children and teachers were suffering from the flu.
Cases are popping up in other parts of the country.
"Already this year, we see an increase in cases only a few weeks earlier than might be normal," says Dr. Buddy Creech from Vanderbilt University Medical Center.
Doctors now insist on the time for a flu shot.
The vaccine is not perfect. They may still get sick, but studies have shown that the vaccine can reduce the severity of the illness and prevent flu deaths.
Slightly more than a third of adults received flu shots last year, and this was one of the worst since records. 80,000 flu-related deaths and 900,000 hospitalizations were reported.
Meanwhile, the Food and Drug Administration has recently approved a new drug for the treatment of influenza. Doctors say Xofluza works with only one dose.
Xofluza will cost $ 1
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