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Weekly Report 2016 Week 19 (May 08 – May 14, 2016) through 2017 Week 19 (May 07 – May 13)
Department of Health and Human Services
Divis ion of Publ ic and Behavioral Health
Office of Publ ic Health Informatics and Epidemiology
Brian Sandoval
Governor
State of Nevada
Richard Whitley, MS
Director
Department of Health and Human Services
Cody L. Phinney, MPH
Administrator
Division of Public and Behavioral Health
John DiMuro, DO, MBA
Chief Medical Officer
Division of Public and Behavioral Health
June 2017
Edition 1.0
Influenza Weekly Report v 2017 i 19 (May 07 – May 13, 2017)
Page 1 of 5
Data for the graphs and tables on the following pages are provisional and may be updated as additional information becomes available.
Purpose
The purpose of this report is to provide an overview of and statistics for the influenza season in Nevada for the local public health authorities, sentinel
providers and the public.
Sentinel Provider Data: Influenza-Like Illness Network Surveillance (ILINet)
Respiratory specimens are tested for influenza by the World Health Organization (WHO) and National Respiratory and Enteric Virus Surveillance
System (NRVESS) collaborating laboratories by sub-type. During week 19, there were 9,820 specimens collected and tested for influenza, of those
496 were positive (5.1%).
Figure 1
Source of Data: CDC: FluView Weekly Report.
The Nevada total includes laboratory tests for all Nevada residents tested by sentinel providers including out of state laboratories. Laboratory data
is obtained from CDC’s ILINet system. During week 19, where there were 13 specimens collected and 1 was positive. There is a two week delay for
laboratory surveillance. Data are subject to change as we receive additional reports.
Figure 2
Source of Data: CDC: ILINet.
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2015-2016 2016-2017
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National Influenza Positive Tests by Week53 Week Comparison (2016 WK 19 - 2017 WK 19)
2009H1N1 A(H3) A(Unknown Subtyping) B (Victoria Lineage)
B (Yamagata Lineage) B(Unknown Subtyping) Percent Positive
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2015-2016 2016-2017
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Nevada (ILI Providers) Influenza Laboratory Confirmed Positive by Week53 Week Comparison (2016 WK 19 - 2017 WK 19)
2009H1N1 A(H3) A(Subtyping not performed) B (Victoria Lineage)
B (Yamagata Lineage) B(Unknown Subtyping) Percent Positive
Influenza Weekly Report v 2017 i 19 (May 07 – May 13, 2017)
Page 2 of 5
Nevada State Public Health Laboratory (NSPHL) has tested 344 specimens for influenza from sentinel providers, of which there have been 292
positive (84.9%). Southern Nevada Public Health Laboratory (SNPHL) has tested 75 specimens this season of which there have been 7
positives. Nationally, there have been 923,837 specimens sent to the WHO and NERVSS laboratories of which 159,421 have been positive
(17.3%). The national numbers in Table 1 are reflected in Figure 1. The state of Nevada data in Table 1 is reflected in Figure 2. The Nevada
total includes laboratory test for all Nevada residents tested by sentinel providers, including out of state laboratories.
Table 1
Influenza Specimens Tested State and Nationally through Sentinel Providers
NSPHL
SNPHL
All Other Laboratories
State of Nevada (Week 19)
State of Nevada (Season)
National (Week 19)
National (Season)
# % # % # % # %
Specimens Tested 344 75 643 13 1,062 9,820 923,837
Influenza Positives 292 7 104 1 7.7 403 37.9 496 5.1 159,421 17.3
Influenza A: 264 5 86 1 100.0 355 88.1 143 28.8 115,519 72.5
A (2009 H1N1) 11 0 1 0 0.0 12 3.4 1 0.7 882 0.8
A (H3) 253 5 8 0 0.0 266 74.9 35 24.5 30,306 26.2
A (Sub-typing not performed) 0 0 77 1 100.0 77 21.7 107 74.8 84,331 73.0
Influenza B: 28 2 18 0 0.0 48 11.9 353 71.2 49,902 27.5
B (Victoria Lineage) 1 0 0 0 0.0 1 2.1 5 1.4 1,885 4.3
B (Yamagata Lineage) 27 0 1 0 0.0 28 58.3 23 6.5 4,622 10.5
B (Sub-typing not performed)
0 2 17 0 0.0 19 39.6 325 92.1 37,395 85.2
Source of Data: CDC: FluView Report and CDC: ILINet.
Influenza-like Illness (ILI) Surveillance Network has each sentinel provider report the number of patients seen that meet the ILI case definition
and the total number of patients seen for any reason each week. The “percentage of visits for ILI” is the number of ILI patients divided by the total
number of patients visit per week. Nevada’s percentage of ILI visits for week 19 is 0.8% which is below the state baseline of 1.5%. Region 9 ILI
percentage for week 19 is 1% which is the below the region baseline 2.5%. Region 9 includes the following states/territory: Arizona, California,
Guam, Hawaii, and Nevada. The national ILI percentage for week 19 is 1.3% which is below the national baseline 2.2%.
Figure 3
Source of Data: CDC: Flu View Report and CDC: ILINet.
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2015-2016 2016-2017
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Percentage of Visits for ILI Reported to Outpatient ILI Surveillance Network,Comparison Between National, Regional, and State,53 Week Comparison (2016 WK 19 - 2017 WK 19)
Nevada Region 9 National
Nevada Baseline Region 9 Baseline National Baseline
Influenza Weekly Report v 2017 i 19 (May 07 – May 13, 2017)
Page 3 of 5
During week 19, 0.8% of visits to sentinel providers were due to ILI; this is higher than the 2015-2016 influenza season (0.3%). There were
16,865 patients seen by sentinel providers during week 19, of which 142 patients presented with ILI; week 19 of 2016, there were 34 patients
seen with ILI (11,039 total patients seen).
Figure 4
Source of Data: CDC: ILINet.
Influenza-like Illness is reported by age groups. During week 19, patients age 5-24 were the greatest number of patients seen with ILI, at 46 patients
seen. The rate for week 19 is 4.8 per 100,000 population. The rate is calculated by the number of patients presented with ILI, divided by the state
population, multiplied by 100,000. The estimated state population for 2017 is 2,935,490.
Figure 5
Source of Data: CDC: ILINet.
Influenza Positive Surveillance (NBS and NETSS)
Positive cases of influenza are reported to the state health authority for surveillance purposes. Table 2 and Figure 6 reflect all positive influenza cases
reported to the state. Types of influenza testing include commercial rapid diagnostic test (rapid), viral culture, fluorescent antibody, enzyme
immunoassay, RT-PCR (PCR), and Immunohistochemistry. The two most common test types in Nevada are Rapid and PCR tests. During week 19,
there were 56 influenza cases reported to the state, 3 influenza A, 52 influenza B and 1 unknown subtyping.
Table 2
Reporting Jurisdiction
Reported Influenza Cases by County Jurisdiction and Influenza Type
Current Week (Week 19) Cumulative Influenza Season
A B Unknown Total A B Unknown Total
Carson City Health and Human Services 1 20 0 21 831 121 3 955
Rural Community Health Services 0 2 0 2 582 66 37 685
Southern Nevada Health District 0 10 0 10 3,402 874 228 4,504
Washoe County Health District 1 29 2 32 1,989 261 154 2,404
State of Nevada 2 61 2 65 6,804 1,322 422 8,548
Source: OPHIE: NBS and SNHD: NETSS.
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Nevada Percentage of Visits for Influenza-like Illness, Weekly Summary53 Week Comparison (2016-2017)
2016 WK 18 - 2017 WK 18 2015 WK 18 - 2016 WK 18 2014 WK 18 - 2015 WK 18
2013 WK 18 - 2014 WK 18 2012 WK 18 - 2011 WK 18 Baseline
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2015-2016 2016-2017
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ILINet: Influenza-like Illness by Age Group and MMWR Week and Incidence Rate 53 Week Comparison (2016 WK 19 - 2017 WK 19)
0-4 5-24 25-49 50-64 65+ Rate
Influenza Weekly Report v 2017 i 19 (May 07 – May 13, 2017)
Page 4 of 5
Figure 6
Source of Data: OPHIE: NBS and SNHD: NETSS.
Hospitalizations
There were 5 hospitalization associated with influenza reported to the state health authority for week 19.
Table 3
Influenza Hospitalizations
Reporting Jurisdiction Current Week (Week 18) Cumulative Influenza Season
# % # %
Carson City Health and Human Services 0 0.0 35 6.6 Rural Community Health Services 0 0.0 20 3.8
Southern Nevada Health District 0 0.0 178 33.8 Washoe County Health District 5 100 294 55.8
State of Nevada 5 100 527 100 Source: Reported to Office of Public Health Informatics and Epidemiology from each Jurisdiction.
Pneumonia and Influenza (P&I) Mortality Surveillance
The Pneumonia and Influenza (P&I) mortality percentage is all deaths, where Pneumonia or Influenza is listed as the underlying or contributing cause
of death, divided by the total deaths in Nevada for each week. As of May 23rd, there were 30 P&I deaths and 332 total deaths for week 19 in Nevada.
The CDC’s most up-to-date National and National Epidemic Threshold data was for week 17.
Figure 7
Source: OVR: WEVRRS and CDC: FluView.
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2015-2016 Season 2016-2017
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Weekly Reported Influenza by Subtype as Compared with Respiratory Syncytial Virus Infections (RSV) 53 Week Comparison (2016 WK 19 - 2017 WK 19)
RSV Influenza A Influenza B
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Pneumonia and Influenza (P&I) Mortality by Week,NCHS Mortality Surveillance Data Compared to Nevada
53 Week Comparison (2016 WK 19 - 2017 WK 19)
Nevada National National Epidemic Threshold
Influenza Weekly Report v 2017 i 19 (May 07 – May 13, 2017)
Page 5 of 5
Technical Notes Data are subject to changes, additionally, there is a lag in reporting.
Influenza surveillance procedures vary by jurisdiction.
Influenza-like illness (ILI): a fever greater than or equal 100℉ with cough and/or sore throat.
Percent positive: The number of positive influenza laboratory tests divided by the total number of tests performed.
Incidence rate is per 100,000 population as estimated by the state demographer.
This report contains information from national and state-level data sources. Influenza surveillance data is collected by a various systems,
including:
Influenza-like Illness Network (ILINet): a sentinel surveillance system in collaboration with the Centers for the Disease Control and
Prevention (CDC) where outpatient providers report ILI information weekly.
National Electronic Telecommunication System for Surveillance (NETSS): a system whereby data is transmits to CDC. Influenza
data collected through NETSS does not provide influenza sub-typing information.
National Electronic Disease Surveillance System (NEDSS): a system for collecting data and monitoring disease trends and
outbreaks.
NEDSS Based System (NBS): an implementation of the NEDSS standards. It provides a secure, accurate, and efficient means of
collecting, transmitting, and analyzing public health data.
Citations
1. CDC. FluView: A Weekly Influenza Surveillance Report. http://www.cdc.gov/flu/weekly/pastreports.htm.
2. Nevada State Demographer’s Office. 2003-2020 ASRHO Estimates and Projections. Division of Public and Behavioral Health edition.
Vintage 2015.
3. OPHIE. DPBH. NBS. 2015-2017. Accessed May 2017.
4. Office of Vital Records (OVR). DPBH. Web Enabled Vital Records Registry System (WEVRRS) [unpublished data]. 2015-2017. Accessed
May 2017.
5. Southern Nevada Health District (SNHD). NETSS/Trisano. 2015-2017. Accessed May 2017.
Comments, suggestions, and requests for further information may be addressed to:
NEVADA INFLUENZA SURVEILLANCE PROGRAM
OFFICE OF PUBLIC HEALTH INFORMATICS AND EPIDEMIOLOGY
500 DAMONTE RANCH PKWY, STE 657
RENO, NV 89521
TEL: (775) 684-5289
FAX: (775) 684-5999
Compiled and Written by: Liliana E. Wilbert, MPH
Reviewed by: Jennifer Thompson
Melissa Peek-Bullock
Recommended Citation:
Division of Public and Behavioral Health. Office of Public Health Informatics and Epidemiology. Influenza Weekly Report, 2016 Week 19 (May 8, 2016)
through 2017 Week 19 (May 13), Nevada. June 2017 i 10 edition 1.0.
This publication was supported by Cooperative Agreement Number TP000534-02 from the Centers for
Disease Control and Prevention and/or Assistant Secretary for Preparedness and Response. Its contents
are solely the responsibility of the authors and do not necessarily represent the official views of the
Centers for Disease Control and Prevention and/or Assistant Secretary for Preparedness and Response.
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