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 7, ending February 18, the geographic spread of influenza in Puerto Rico and 44 states was reported as widespread.
Full report also available as PDF
2016-2017 Influenza Season Week 7 ending February 18, 2017
All data are preliminary and may change as more reports are received.
During week 7 (February 12-18 2017), influenza activity decreased slightly but remained elevated in the United States.
- Viral Surveillance: The most frequently identified influenza virus subtype reported by public health laboratories during week 7 was influenza A (H3). The percentage of respiratory specimens testing positive for influenza in clinical laboratories decreased slightly but remained elevated.
- Pneumonia and Influenza Mortality: The proportion of deaths attributed to pneumonia and influenza (P&I) was above the system-specific epidemic threshold in the National Center for Health Statistics (NCHS) Mortality Surveillance System.
- Influenza-associated Pediatric Deaths: Five influenza-associated pediatric deaths were reported.
- Influenza-associated Hospitalizations: A cumulative rate for the season of 33.7 laboratory-confirmed influenza-associated hospitalizations per 100,000 population was reported.
- Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 4.8%, which is above the national baseline of 2.2%. Nine regions reported ILI at or above their region-specific baseline levels. 27 states experienced high ILI activity; New York City and five states experienced moderate ILI activity; Puerto Rico and 10 states experienced low ILI activity; eight 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 and 44 states was reported as widespread; Guam and four states reported regional activity; the District of Columbia and one state reported local activity; one state reported sporadic activity; and the U.S. Virgin Islands reported no activity.