As many as one million Americans now have swine flu, US health officials said, adding that 6% or
more of some urban areas are infected.
The estimate - voiced by a government flu scientist - was no surprise to the experts who have
been closely watching the virus.
"We knew diagnosed cases were just the tip of the iceberg," said Dr William Schaffner, a
Vanderbilt University infectious diseases expert who was in Atlanta for the meeting of a vaccine
advisory panel.
Lyn Finelli, a flu surveillance official with the Centres for Disease Control and Prevention (CDC),
Source:
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