National Center for Immunization and Respiratory Diseases (U.S.). Influenza Division.

All data are preliminary and may change as more reports are received.

Synopsis: During week 2 (January 8-14, 2012), influenza activity in the United States remained relatively low.

• U.S. Virologic Surveillance: Of the 3,771 specimens tested by U.S. World Health Organization (WHO) and National Respiratory and Enteric Virus Surveillance System (NREVSS) collaborating laboratories and reported to CDC/Influenza Division, 138 (3.7%) were positive for influenza.

• Pneumonia and Influenza (P&I) Mortality Surveillance: The proportion of deaths attributed to P&I was below the epidemic threshold.

• Influenza-associated Pediatric Mortality: No influenza-associated pediatric deaths were reported.

• Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 1.2%, which is below the national baseline of 2.4%. All 10 regions reported ILI below region-specific baseline levels. New York City and all 50 states experienced minimal ILI activity and the District of Columbia had insufficient data.

• Geographic Spread of Influenza: The geographic spread of influenza in one state was reported as regional; eight states reported local activity; Puerto Rico and 38 states reported sporadic activity, and the District of Columbia, Guam, the U.S. Virgin Islands, and three states reported no influenza activity.

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