Oregon, New Mexico, Louisiana and Tennessee were all identified as having the highest levels of outpatient respiratory illness activity during the most recent weekly report, ending on Jan. 4.
Forty-three states are reporting very high or high flu activity, and of respiratory samples that tested positive for flu at public health labs, nearly 98% were influenza A. Of subtyped samples, 55.5% were H3N2, and 44.5% were 2009 H1N1.
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