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

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

2016-2017 Influenza Season Week 44 ending November 5, 2016

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

Synopsis:

During week 44 (October 30-November 5, 2016), influenza activity was low in the United States.

• Viral Surveillance: The most frequently identified influenza virus subtype reported by public health laboratories during week 44 was influenza A (H3). The percentage of respiratory specimens testing positive for influenza in clinical laboratories increased slightly but remained low.
• 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 1.4%, which is below the national baseline of 2.2%. All 10 regions reported ILI below region-specific baseline levels. Puerto Rico experienced moderate ILI activity, one state experienced low ILI activity, New York City and 49 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 one state was reported as regional; six states reported local activity; the District of Columbia, the U.S. Virgin Islands and 39 states reported sporadic activity; and four states reported no activity.