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Weekly Report 2015 Week 50 (December 13 – December 19) through 2016 Week 50 (December 11 – December 17)
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
January 2017
Edition 1.0
Influenza Weekly Report v 2016 i 50 (December 11 – December 17, 2016)
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 50, there were 20,400 specimens collected and tested for influenza, of those
1,790 were positive (8.8%).
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. During week 50,
there were 59 specimens collected and 23 were positive (39.0%).
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 (2015 WK 50- 2016 WK 50)
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 (2015 WK 50 - 2016 WK 50)
2009H1N1 A(H3) A(Subtyping not performed) B (Victoria Lineage)B (Yamagata Lineage) B(Unknown Subtyping) Percent Positive
Influenza Weekly Report v 2016 i 50 (December 11 – December 17, 2016)
Page 2 of 5
Nevada State Public Health Laboratory (NSPHL) has tested 124 specimens for influenza from sentinel providers, of which there have been 101
positive (81.5%). Southern Nevada Public Health Laboratory (SNPHL) has tested 33 specimens this season of which there have been 0
positives. Nationally, there have been 196,055 specimens sent to the WHO and NERVSS laboratories of which 7,187 have been positive (4.0%).
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 50)
State of Nevada (Season)
National (Week 50)
National (Season)
# % # % # % # %
Specimens Tested 124 33 157 59 314 20,400 196,055
Influenza Positives 101 0 14 23 39.0 115 36.6 1,790 8.8 7,809 4.0
Influenza A: 101 0 12 23 100 113 98.3 1,572 87.8 6,187 79.2
A (2009 H1N1) 7 0 1 0 0.0 8 7.1 12 .08 107 1.7
A (H3) 94 0 1 18 78.3 95 84.1 458 29.1 2,110 34.1
A (Sub-typing not performed) 0 0 10 5 21.7 10 8.8 1,102 70.1 3,970 64.2
Influenza B: 0 0 2 0 0.0 2 1.7 218 12.2 1,622 20.8
B (Victoria Lineage) 0 0 0 0 0.0 0 0.0 10 4.6 72 4.4
B (Yamagata Lineage) 0 0 0 0 0.0 0 0.0 10 4.6 52 3.2
B (Sub-typing not performed)
0 0 2 0 0.0 2 100 198 90.8 1,498 92.4
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 50 is 1.5% which is at the state baseline of 1.5%. Region 9 ILI
percentage for week 50 is 2.5% which is at the region baseline 2.5%. Region 9 includes the following states/territory: Arizona, California, Guam,
Hawaii, and Nevada. The national ILI percentage for week 50 is 2.3% which is above the national baseline 2.2%.
Figure 3
Source of Data: CDC: Flu View Report and CDC: ILINet.
During week 50, 1.5% of visits to sentinel providers were due to ILI; this is higher than the 2015-2016 influenza season (1.1%). There were
17,933 patients seen by sentinel providers during week 50, of which 266 patients presented with ILI; week 50 of 2015, there were 182 patients
seen with ILI (17,128 total patients seen).
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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 (2015 WK 50 - 2016 WK 50)
Nevada Region 9 NationalNevada Baseline Region 9 Baseline National Baseline
Influenza Weekly Report v 2016 i 50 (December 11 – December 17, 2016)
Page 3 of 5
Figure 4
Source of Data: CDC: ILINet.
Influenza-like Illness is reported by age groups. During week 50, patients age 5-25 were the greatest number of patients seen with ILI, at 87 patients
seen. The rate for week 50 is 9.2 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 2016 is 2,902,853.
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 50,
there were 523 influenza cases reported to the state, 495 influenza A, 8 influenza B and 20 unknown subtyping.
Table 2
Reporting Jurisdiction
Reported Influenza Cases by County Jurisdiction and Influenza Type
Current Week (Week 50) Cumulative Influenza Season
A B Unknown Total A B Unknown Total
Carson City Health and Human Services 66 0 0 66 313 0 2 315
Rural Community Health Services 28 0 0 28 193 8 11 212
Southern Nevada Health District 152 6 5 163 432 34 22 488
Washoe County Health District 249 2 15 266 970 19 69 1,058
State of Nevada 495 8 20 523 1,908 61 104 2,073
Source: OPHIE: NBS and SNHD: NETSS.
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Nevada Percentage of Visits for Influenza-like Illness, Weekly Summary53 Week Comparison (2011-2016)
2015WK 50 - 2016WK 50 2014 WK 50 - 2015 WK 50 2013 WK 50 - 2014 WK 50
2012 WK 50 - 2013 WK 50 2011 WK 50 - 2012 WK 50 Baseline
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ILINet: Influenza-like Illness by Age Group and MMWR Week and the Incidence Rate53 Week Comparison (2015 WK 50 - 2016 WK 50)
0-4 5-24 25-49 50-64 65+ Rate
Influenza Weekly Report v 2016 i 50 (December 11 – December 17, 2016)
Page 4 of 5
Figure 6
Source of Data: OPHIE: NBS and SNHD: NETSS.
Hospitalizations
There were 43 hospitalization associated with influenza reported to the state health authority for week 50.
Table 3
Influenza Hospitalizations
Reporting Jurisdiction Current Week (Week 50) Cumulative Influenza Season
# % # %
Carson City Health and Human Services 0 0.0 3 1.7 Rural Community Health Services 2 4.7 3 1.7
Southern Nevada Health District 13 30.2 56 31.8 Washoe County Health District 28 65.1 114 64.8
State of Nevada 43 100 176 100 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 January 3rd, there were 28 P&I deaths and 370 total deaths for week 50 in Nevada.
The P&I mortality percent for Nevada is at 7.6%. Nationally, the P&I mortality percent has not been published for week 50.
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 (2015 WK 50 - 2016 WK 50)
RSV Influenza A Influenza B Unknown Influenza Subtyping
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Pneumonia and Influenza (P&I) Mortality by Week,NCHS Mortality Surveillance Data Compared to Nevada
53 Week Comparison (2015 WK 50- 2016 WK 50)
Nevada National National Epidemic Threshold
Influenza Weekly Report v 2016 i 50 (December 11 – December 17, 2016)
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. 2015-2016. Accessed December 2017.
4. Office of Vital Records (OVR). DPBH. Web Enabled Vital Records Registry System (WEVRRS) [unpublished data]. 2015-2016. Accessed
January 2017.
5. Southern Nevada Health District (SNHD). NETSS/Trisano. 2015-2016. Accessed January 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, 2015 Week 50 (December
13) through 2016 Week 50 (December 17), Nevada. December 2016 i 50 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.