Swine flu spreading too fast to count, CDC says
Confirmed cases are only the ‘tip of the iceberg,’ health official says
Swine flu is spreading so far and fast in the U.S. that state health officials may soon stop counting individual cases, a federal health official said Monday.
The novel H1N1 virus accounted for 40 percent of flu viruses logged in the U.S. in the past week and helped propel an uptick in overall flu-like illnesses,
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