New CDC Report on Influenza, Plus a Quiz for Clinicians

The Centers for Disease Control and Prevention (CDC) has issued a new surveillance report for the week ending January 17, 2015 on influenza-related mortality, hospitalizations, and outpatient illness, as well as the geographic spread.

Eleven pediatric deaths associated with influenza were reported and the proportion of deaths attributed to pneumonia and influenza (P&I) was above the epidemic threshold. Also reported was a cumulative rate of 36.3 laboratory-confirmed influenza-associated hospitalizations per 100,000 population. The proportion of outpatient visits for influenza-like illness (ILI) was above the national baseline of 2.0%, at 4.5%. All 10 regions reported ILI at or above region-specific baseline levels, with Puerto Rico and 23 states experiencing high ILL activity. Forty-four states reported widespread influenza activity.

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Of the 26,205 specimens that were tested in the previous week, 5,104 were positive for influenza. The majority were Influenza A (94%), with A(H1N1)pdm09 at 3%, A(H3N2) at 37.9%, and subtyping not performed at 62%. High levels of resistance to amantadine and rimantadine persist among A(H1N1)pdm09 and A(H3N2) viruses.

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