2017-2018 Influenza Season Week 45 ending November 11, 2017
During week 45 (November 5-11, 2017), influenza activity is increasing in the United States.
- Viral Surveillance: The most frequently identified influenza virus type reported by public health laboratories during week 45 was influenza A. The percentage of respiratory specimens testing positive for influenza in clinical laboratories is increasing.
- 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 1.9%, which is below the national baseline of 2.2%. One region reported ILI at or above their region-specific baseline level. One state experienced high ILI activity; two states experienced moderate ILI activity; six states experienced low ILI activity; New York City, and the District of Columbia, Puerto Rico, and 41 states experienced minimal ILI activity.
- Geographic Spread of Influenza: The geographic spread of influenza in Guam, Puerto Rico and nine states was reported as regional; 13 states reported local activity; the U.S. Virgin Islands and 26 states reported sporadic activity; and the District of Columbia and two states reported no activity.
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