Synopsis:
During week 42 (October 15-21, 2017), influenza activity was low in the United States.
- Viral Surveillance: The most frequently identified influenza virus type reported by public health laboratories during week 42 was influenza A. The percentage of respiratory specimens testing positive for influenza in clinical laboratories is 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: One influenza-associated pediatric death was reported.
- Outpatient Illness Surveillance:The proportion of outpatient visits for influenza-like illness (ILI) was 1.3%, which is below the national baseline of 2.2%. All 10 regions reported ILI below region-specific baseline levels. Three states experienced low ILI activity and New York City, the District of Columbia, Puerto Rico and 47 states experienced minimal ILI activity.
- Geographic Spread of Influenza: The geographic spread of influenza in Guam was reported as regional; Puerto Rico and 12 states reported local activity; the District of Columbia and 33 states reported sporadic activity; five states reported no activity; and the U.S. Virgin Islands did not report.
Weekly U.S. Influenza Surveillance Report
CDC Influenza Division collects and analyzes information on influenza illness year-round in the U.S. and produces FluView, a weekly surveillance report. According to this week’s FluView report, seasonal influenza activity is low overall across the U.S. For the week ending October 14, all 50 states and Puerto Rico experienced minimal influenza-like illness.
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