Weekly U.S. Influenza Surveillance Report | Seasonal Influenza (Flu) | CDC

Weekly U.S. Influenza Surveillance Report | Seasonal Influenza (Flu) | CDC

The CDC Influenza Division collects, compiles, and analyzes information on Influenza activity year-round in the US and produces FluView, a weekly influenza surveillance report. During week 48, ending December 3, Puerto Rico experienced high activity while New York, Colorado, Georgia, Louisiana, and Nevada experienced low activity. The remaining 46 states experienced minimal activity.

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Weekly U.S. Influenza Surveillance Report

Full report also available as PDF

2016-2017 Influenza Season Week 48 ending December 3, 2016

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

Synopsis:

During week 48 (November 27 - December 3, 2016), influenza activity increased slightly, but remained low in the United States.

• Viral Surveillance:The most frequently identified influenza virus subtype reported by public health laboratories during week 48 was influenza A (H3). The percentage of respiratory specimens testing positive for influenza in clinical laboratories remained low.
• Pneumonia and Influenza Mortality: Due to data processing problems, the National Center for Health Statistics (NCHS) mortality surveillance data for the week ending November 19, 2016 (week 46) will not be published this week.
• Influenza-associated Pediatric Deaths: No influenza-associated pediatric deaths were reported.
• Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 1.8%, which is below the national baseline of 2.2%. Two regions reported ILI at or above their region-specific baseline levels. Puerto Rico experienced high ILI activity, New York City and four states experienced low ILI activity, 46 states experienced minimal ILI activity, and the District of Columbia had insufficient data.
• Geographic Spread of Influenza:The geographic spread of influenza in Puerto Rico was reported as widespread; Guam and two states were reported as regional; 19 states reported local activity; the U.S. Virgin Islands and 28 states reported sporadic activity; one state reported no activity; and the District of Columbia did not report.