Influenza Surveillance


Percentage of Visits for Influenza-like Illness (ILI) Reported by ILINet Sites, Kansas, October 2013-September 2014 and the Previous Two Surveillance Periods*

Percentage of Visits for Influenza-like Illness (ILI) Reported by ILINet Sites

*ILINet sites may vary in number and type (student health, family practice, etc.) each season. Data from the previous two surveillance years are plotted according to week number corresponding to the 2013-2014 week ending date; for example, week 40 ended October 5, 2013 week 40 of 2012 ended October 6, 2012, and week 40 of 2011 ended October 8, 2010.

20 of 36 (56%) sites submitted data by the reporting deadline for the current week.


About Influenza Surveillance in Kansas

Kansas regulations do not require health care providers to notify KDHE when a patient is diagnosed with influenza.  Instead, influenza activity is measured through the U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet), a collaboration between the Centers for Disease Control and Prevention (CDC) and state, local, and territorial health departments.

Each week, ILINet clinics determine the percentage of patients seen with Influenza-like Illness (ILI). Influenza-like illness is defined as fever (≥100°F) with cough and/or sore throat, in the absence of a known cause other than influenza. Data is collected from Sunday through Saturday of each week. Clinics are asked to submit the previous week’s data by noon each Tuesday.

The information reflects data collected for the week ending the previous Saturday.  The above chart shows the percentage of ILI visits reported by week.  The percentage was calculated by dividing the number of patients seen with ILI at the clinics by the total number of patients seen and multiplying by 100.

The information on this chart may change over time, as ILINet sites may adjust their data submissions, and additional submissions may be received after Tuesday’s deadline.


Influenza Specimens Tested by KHEL

About Influenza Testing in Kansas

The above chart shows the number of specimens the Kansas Department of Health and Environmental Laboratories (KHEL) tested for influenza per week. Only specimens from outpatients visiting ILINet clinics or from hospitalized patients are tested; because not all patients are tested at KHEL, this chart may not represent the true percentage of patients infected with influenza, or the true incidence of influenza strains circulating in Kansas.

About Respiratory Virus Testing in Kansas

In addition to influenza testing by PCR, the Kansas Health and Environmental Laboratories (KHEL) also tests negative influenza specimens via a respiratory viral panel (RVP). A subset of negative influenza specimens are tested with the RVP, which can probe for the following 12 viral targets: Influenza A, Influenza A subtype H1, Influenza A subtype H3, Influenza B, Respiratory Syncytial Virus subtype A, Respiratory Syncytial Virus subtype B, Parainfluenza 1, Parainfluenza 2, Parainfluenza 3, Human Metapneumovirus, Rhinovirus, and Adenovirus. The goal of RVP testing is to better understand which respiratory viruses are circulating in Kansas during influenza season.

For the 2013-14 season, Via Christi Laboratories in Sedgwick County will be sharing its RVP data with KDHE. Via Christi Laboratories' RVP can detect Parainfluenza 4 and four different coronaviruses in addition to the 12 targets in the RVP panel used by KHEL; RVP results are sent to KDHE monthly and will represent the majority of respiratory virus surveillance in the south central region of Kansas. The resources available at KHEL will be focused on the remaining five regions of the state.

Positive Respiratory Viral Panel Results

*Via Christi Laboratories uses an RVP panel to test patient specimens, which can detect Parainfluenza 4 and four different coronaviruses in addition to the 12 targets in the RVP panel used by the Kansas Health and Environmental Laboratories.
Via Christi Laboratories tests specimens from patients seen at Via Christi hospitals as well as specimens from AMS Reference Laboratory. RVP results are sent to KDHE monthly and will represent the majority of respiratory virus surveillance in the south central region of Kansas.

Please visit Children’s Mercy Hospital’s website to find RVP results from the Kansas City metro area.


Percent of Deaths Associated with Pneumonia and Influenza by Surveillance Period

Percent of Deaths Associated with Pneumonia and Influenza by Surveillance Period, Kansas, October 2013 – September 2014 and Previous Two Surveillance Periods*

Influenza Specimens Tested by KHEL

Kansas Resident Pneumonia & Influenza Related Deaths by Causal Relationship, September-May

Numbers based on date of death. Surveillance data is provisional and subject to change.

  Season
2011-12 Season 2012-13 Season 2013-14 Season
N Percent N Percent N Percent
Pneumonia or Influenza - Contributing Factor in Death 909 65.9 921 63.6 721 63.5
Influenza - Direct Cause of Death 13 0.9 58 4.0 34 3.0
Pneumonia - Direct Cause of Death 458 33.2 470 32.4 380 33.5
Total 1380 100.0 1449 100.0 1135 100.0

Source: KDHE Bureau of Epidemiology and Public Health Informatics, Office of Vital Statistics

Deaths Associated with Pneumonia and Influenza are those deaths with underlying or contributing causes that include ICD10 codes 'J09-J11.9 - INFLUENZA' and J12-J18.9 - PNEUMONIA'. In accordance with CDC guidance deaths are counted based on the date the event was registered and not the date of the death.

The X-axis represents the week ending dates for the 2012-13 surveillance period. Data from the previous two surveillance periods are plotted according to the week number corresponding to the 2012-13 week.

National Influenza Surveillance


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