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

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

2017-2018 Influenza Season Week 43 ending October 28, 2017

Synopsis:

During week 43 (October 22-28, 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 43 was influenza A. The percentage of respiratory specimens testing positive for influenza in clinical laboratories is low.
• Novel Influenza A Virus: Three human infections with novel influenza A viruses were 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 that occurred during the 2016-2017 season.
• Outpatient Illness Surveillance:The proportion of outpatient visits for influenza-like illness (ILI) was 1.5%, which is below the national baseline of 2.2%. All 10 regions reported ILI below region-specific baseline levels. One state experienced moderate ILI activity, four states experienced low ILI activity, New York City and 45 states experienced minimal ILI activity, and the District of Columbia and Puerto Rico had insufficient data.
• Geographic Spread of Influenza: The geographic spread of influenza in Guam and four states was reported as regional; Puerto Rico and 12 states reported local activity; the District of Columbia and 31 states reported sporadic activity; one state reported no activity; and the U.S. Virgin Islands and two states 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 28. Wyoming experienced moderate ILI activity, four states experienced low ILI activity (Georgia, Louisiana, South Carolina, and South Dakota)and 45 states experienced minimal ILI activity.

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