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14 Oct 2016

Weekly #US #Influenza #Surveillance #Report - 2016-2017 Season, Wk 40 ending Oct. 8, ‘16 (@CDCgov, Oct. 14 ‘16)

 

Title: Weekly #US #Influenza #Surveillance #Report - 2016-2017 Season, Wk 40 ending Oct. 8, ‘16.

Subject: Seasonal Influenza, weekly activity surveillance report.

Source: US Centers for Disease Control and Prevention (CDC), FluView, full page: (LINK). Excerpt.

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Weekly U.S. Influenza Surveillance Report - 2016-2017 Influenza Season, Week 40 ending October 8, 2016

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

 

Background:

The Centers for Disease Control and Prevention’s (CDC) Influenza Division collects, compiles, and analyzes information on influenza activity year-round in the United States and produces FluView, a weekly influenza surveillance report, and FluView Interactive , which allows for more in-depth exploration of influenza surveillance data. The U.S. influenza surveillance system provides information in five categories collected from eight data sources. This is the first report of the 2016-2017 influenza season, which began on October 2, 2016.

The five categories and eight data components of CDC influenza surveillance are:

  • Viral Surveillance: U.S. World Health Organization (WHO) collaborating laboratories, the National Respiratory and Enteric Virus Surveillance System (NREVSS), and human infection with novel influenza A virus case reporting;
  • Mortality: National Center for Health Statistics (NCHS) Mortality Surveillance System and influenza-associated pediatric deaths;
  • Hospitalizations: Influenza Hospitalization Network (FluSurv-NET) including the Emerging Infections Program (EIP) and three additional states;
  • Outpatient Illness Surveillance: U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet);
  • Geographic Spread of Influenza: State and territorial epidemiologists’ reports.

An overview of the CDC influenza surveillance system, including methodology and detailed descriptions of each data component, is available at: http://www.cdc.gov/flu/weekly/overview.htm.

Synopsis:

  • During week 40 (October 2-8, 2016), influenza activity was low in the United States.
    • Viral Surveillance:
      • The most frequently identified influenza virus type reported by public health laboratories during week 40 was influenza A.
      • The percentage of respiratory specimens testing positive for influenza in clinical laboratories is 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 1.1%, which is below the national baseline of 2.2%.
      • All 10 regions reported ILI below region-specific baseline levels.
      • New York City and 50 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 was reported as widespread; Puerto Rico and one state reported local activity; the U.S. Virgin Islands and 36 states reported sporadic activity; and the District of Columbia and 13 states reported no activity.

 

National and Regional Summary of Select Surveillance Components

[HHS Surveillance Regions* - Data for current week: Out-patient  ILI† - Number of jurisdictions reporting regional or widespread activity§  - % respiratory specimens positive for flu in clinical laboratories‡  Data cumulative since October 2, 2016 (week 40): A(H1N1)pdm09 - A (H3) - A (Subtyping not Performed) - B Victoria lineage - B Yamagata lineage - B lineage not performed  - Pediatric Deaths]

Influenza test results from public health laboratories only

  • Nation – Normal - 1 of 54 - 1.7% – 4 – 28 – 5 – 1 – 0 – 2 – 0
    • Region 1 – Normal - 0 of 6 - 0.5% – 0 – 4 – 0 – 0 – 0 – 0 – 0
    • Region 2 – Normal - 0 of 4 - 0.6% – 0 – 0 – 0 – 0 – 0 – 0 – 0
    • Region 3 – Normal - 0 of 6 - 0.5% – 2 – 0 – 1 – 0 – 0 – 0 – 0
    • Region 4 – Normal - 0 of 8 - 4.2% – 0 – 0 – 1 – 0 – 0 – 1 – 0
    • Region 5 – Normal - 0 of 6 - 0.8% – 0 – 5 – 0 – 0 – 0 – 0 – 0
    • Region 6 – Normal - 0 of 5 - 1.9% – 0 – 0 – 0 – 0 – 0 – 0 – 0
    • Region 7 – Normal - 0 of 4 - 0.1% – 0 – 0 – 2 – 1 – 0 – 0 – 0
    • Region 8 – Normal - 0 of 6 - 0.5% – 2 – 2 – 0 – 0 – 0 – 0 – 0
    • Region 9 – Normal - 1 of 4 - 1.2% – 0 – 7 – 0 – 0 – 0 – 1 – 0
    • Region 10 – Normal - 0 of 4 - 2.4% – 0 – 10 – 1 – 0 – 0 – 0 – 0

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*HHS regions (Region 1 CT, ME, MA, NH, RI, VT; Region 2: NJ, NY, Puerto Rico, US Virgin Islands; Region 3: DE, DC, MD, PA, VA, WV; Region 4: AL, FL, GA, KY, MS, NC, SC, TN; Region 5: IL, IN, MI, MN, OH, WI; Region 6: AR, LA, NM, OK, TX; Region 7: IA, KS, MO, NE; Region 8: CO, MT, ND, SD, UT, WY; Region 9: AZ, CA, Guam, HI, NV; and Region 10: AK, ID, OR, WA).

† Elevated means the % of visits for ILI is at or above the national or region-specific baseline

§ Includes all 50 states, the District of Columbia, Guam, Puerto Rico, and U.S. Virgin Islands

‡ National data are for current week; regional data are for the most recent three weeks

 

U.S. Virologic Surveillance

WHO and NREVSS collaborating laboratories, which include both public health and clinical laboratories located in all 50 states, Puerto Rico, and the District of Columbia, report to CDC the total number of respiratory specimens tested for influenza and the number positive for influenza by virus type. In addition, public health laboratories also report the influenza A subtype (H1 or H3) and influenza B lineage information of the viruses they test and the age or age group of the persons from whom the specimens were collected.

Additional data are available at http://gis.cdc.gov/grasp/fluview/fluportaldashboard.html and http://gis.cdc.gov/grasp/fluview/flu_by_age_virus.html.

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The results of tests performed by clinical laboratories during the current week are summarized below.

[Week 40]

  • No. of specimens tested - 9,799
    • No. of positive specimens (%) - 170 (1.7%)
      • Positive specimens by type:
        • Influenza A - 88 (51.8%)
        • Influenza B - 82 (48.2%)

(…)

View National and Regional Level Graphs and Data

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The results of tests performed by public health laboratories, as well as the age group distribution of influenza positive tests, during the current week are summarized below.

[Week 40]

  • No. of specimens tested – 403
    • No. of positive specimens – 40
      • Positive specimens by type/subtype:
        • Influenza A - 37 (92.5%)
          • A(H1N1)pmd09 - 4 (10.8%)
          • H3 - 28 (75.7%)
          • Subtyping not performed - 5 (13.5%)
        • Influenza B - 3 (7.5%)
          • Yamagata lineage - 0 (0%)
          • Victoria lineage - 1 (33.3%)
          • Lineage not performed - 2 (66.7%)

(…)

View National and Regional Level Graphs and Data

(…)

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Keywords: US CDC; USA; Updates; Seasonal Influenza.

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