Global & Disaster Medicine

2016-2017 Influenza Season Week 3 ending January 21, 2017


2016-2017 Influenza Season Week 3 ending January 21, 2017


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


During week 3 (January 15-21, 2017), influenza activity increased in the United States..

  • Viral Surveillance: The most frequently identified influenza virus subtype reported by public health laboratories during week 3 was influenza A (H3). The percentage of respiratory specimens testing positive for influenza in clinical laboratories increased.
  • 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: Three influenza-associated pediatric deaths were reported.
  • Influenza-associated Hospitalizations: A cumulative rate for the season of 15.4 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 3.4%, which is above the national baseline of 2.2%. All 10 regions reported ILI at or above their region-specific baseline levels. New York City and 10 states experienced high ILI activity; 10 states experienced moderate ILI activity; Puerto Rico and 17 states experienced low ILI activity; 13 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 37 states was reported as widespread; Guam and 12 states reported regional activity; the District of Columbia and one state reported local activity; and the U.S. Virgin Islands reported no activity.

INFLUENZA Virus Isolated

Genetic Characterization

INFLUENZA Virus Isolated

Click on image to launch interactive tool

Click on graph to launch interactive tool

Click on graph to launch interactive tool2

national levels of ILI and ARI

Weekly Flu Activity Map: Week 03

Comments are closed.


Recent Posts