CDC: Slow flu rise seasoned by pockets of high activity
The US Centers for Disease Control and Prevention (CDC) saw localized pockets of high flu activity last week, but for the nation as a whole, the levels rose only slightly again, according to today's weekly update.
The percentage of respiratory specimens that tested positive for flu registered a modest bump, increasing from 6.8% to 9.1% last week, with the 2009 H1N1 virus holding onto its spot as the predominant strain.