Weekly U.S. Influenza Surveillance Report | Seasonal Influenza (Flu) | CDC
Weekly U.S. Influenza Surveillance Report
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 46, ending November 19, New York and 48 states experienced minimal activity. Georgia and Oklahoma experienced low activity; Puerto Rico experienced high activity.
During week 46 (November 13-19, 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 46 was influenza A (H3). The percentage of respiratory specimens testing positive for influenza in clinical laboratories increased slightly, but remained low.
- Novel Influenza A Virus: One human infection with a novel influenza A virus was reported.
- Pneumonia and Influenza Mortality: The proportion of deaths attributed to pneumonia and influenza (P&I) was below the system-specific epidemic threshold in the National Center for Health Statistics (NCHS) Mortality Surveillance System.
- 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 1.6%, 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, two states experienced low ILI activity, New York City and 48 states experienced minimal ILI activity, and the District of Columbia had insufficient data.
- Geographic Spread of Influenza: The geographic spread of influenza in Guam, Puerto Rico, and the U.S. Virgin Islands was reported as regional; 11 states reported local activity; the District of Columbia and 36 states reported sporadic activity; and three states reported no activity.