Flu usually peaks in midwinter. Symptoms can include fever, cough, runny nose, head and body aches and fatigue. Some people also suffer vomiting and diarrhea, and some develop pneumonia or other severe complications.
Most people with flu have a mild illness. But people with severe symptoms should see a doctor. They may be given antiviral drugs or other medications to ease symptoms.
Some shortages have been reported for children's liquid Tamiflu, a prescription medicine used to treat flu. But health officials say adult Tamiflu pills are available, and pharmacists can convert those to doses for children.
Associated Press writers Dan Sewell in Cincinnati, Catherine Lucey in Des Moines, and Malcolm Ritter in New York contributed to this report.
CDC flu: http://www.cdc.gov/flu/index.htm
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