Situational Overview for the 2024-2025 Season

Report Updated on 03-13-2025

905

hospitalized cases for the season

2%

current percent of outpatient encounters due to influenza

34

flu-associated deaths for the season

Flu A H3

current dominant flu type

Changes in the last week

10

fewer flu hospitalizations than last week

0.2%

decrease in flu outpatient encounters in the last week.

Low

current weekly severity

FluSurv-NET Hospitalizations in Salt Lake County

Hospitalizations and Outcomes by Type
Type Hospitalized Influenza Cases Influenza-Related Deaths
A 891 34
A&B <5 0
B 13 0
 
Hospitalizations and Outcomes by Type and Subtype
Type Influenza Subtype Hospitalized Influenza Cases Influenza-Related Deaths
A Flu A 325 10
A Flu A H1N1 210 5
A Flu A H3 356 19
A&B Multiple Subtypes <5 0
B Flu B 11 0
B Flu B Victoria <5 0
A double asterisk (**) indicates that a column has been suppressed due to low counts. If a column has is empty without a suppression mark it indicates that no cases of that category have been detected this season.
Hospitalizations per Week
2025-01-042025-01-112025-01-182025-01-252025-02-012025-02-082025-02-152025-02-222025-03-012025-03-082024-10-052024-10-122024-10-192024-10-262024-11-022024-11-092024-11-162024-11-232024-11-302024-12-072024-12-142024-12-212024-12-28050100150
Week Ending On# of Hospitalizations
In this figure, weeks with between 1 and 4 cases will show 4 cases to protect privacy.
Hospitalizations by Type and Age Group Rate per 100k for Subtypes with more than 5 cases.
0-45-2425-4950-6465+050100150200250300350
Influenza Subtype/Lineage Lineages Suppressed for Low CountsFlu BFlu A H3Flu A H1N1Flu AInfluenza Hospitalizations by Influenza Type and Age Group Rate per 100kRate per 100,000
Flu types with low counts are suppressed from this figure. Complete age breakdowns for hospitalizations can be found under the ‘Demographics’ tab.
Data notes

Navigating Tables and Graphs

Most of this dashboard is interactive. To get more detailed information about any of the data points shown in a graph or map, hover over (or click) the data point with your mouse cursor. You can also zoom in and select specific date ranges or geographic breakdowns using the mouse cursor. For graphs with a legend, you can isolate any category by double-clicking that category in the legend. To reset the graph, double click anywhere in the legend. To remove one category on a graph, single-click that category in the legend. Sort tables by clicking on column headings. You may also search using the Search box in the top right-hand corner.

In the early season, some features of the report are removed until case count thresholds are met.

Data is lagged a week to allow for case ascertainment.

Data Suppression

Low counts are suppressed to protect potentially identifiable information. A double asterisk (**) indicates that a figure has been suppressed.

Data sources

Hospitalized case data is pulled from the Influenza Hospitalization Surveillance Network (FluSurv-Net). More details about this surveillance system can be found on the CDC Influenza Hospitalization Surveillance Webpage.

Influenza-Like Illness (ILI) is a form of syndromic surveillance that captures the number of people seeking care at an emergency department (ED), InstaCare, or Urgent Care with symptoms matching influenza. This is compared to all visits in the ED, InstaCare or Urgent Care to generate a percentage (ILI %) that is tracked in the above graph.

Risk Factors for Hospitalized Influenza Cases

Hospitalized Comorbidities
Any ComorbidityAsthmaCardiovascular DiseaseChronic Lung DiseaseChronic Metabolic DiseaseImmunosuppressionLiver/GI DiseaseNeurological DisorderObesityPregnantRenal Disease05101520253035
Percent of Cases
A double asterisk (**) indicates that a column has been suppressed due to low counts. If a column has is empty without a suppression mark it indicates that no cases of that category have been detected this season.
Vaccination Status Among Hospitalized Cases by Age
0-45-2425-4950-6465+01020304050607080
No Vaccine or UnknownVaccinatedAge and Vaccination StatusPercent of Hospitalized Cases
A double asterisk (**) indicates that a column has been suppressed due to low counts. If a column has is empty without a suppression mark it indicates that no cases of that category have been detected this season.

Influenza Burden

Below is the estimated burden of influenza cases in Salt Lake County. The methods used to calculate these estimates follow CDC’s methodology* and incorporate Salt Lake County-specific influenza hospitalization testing practices to account for under-detection of hospitalized influenza illnesses.
* Multiplier input is from 2018-2019 due to the COVID-19 pandemic.

Estimated Burden from this Influenza Season
020k40k60k80kCommunity Illnesses (non-medically-attended)Outpatient Medically-Attended IllnessesHospitalized Illnesses
Hospitalized IllnessesOutpatient Medically-Attended IllnessesCommunity Illnesses (non-medically-attended)Number of Illnesses
Table of Estimated Burden
Type Number of Illnesses
Hospitalized Illnesses 1600
Outpatient Medically-Attended Illnesses 84100
Community Illnesses (non-medically-attended) 90600

Influenza Severity Metrics

Influenza Severity Metrics

The severity metric for Salt Lake County is calculated using the Moving Epidemic Method (MEM). Indicators used for severity assessment include deaths (influenza-related deaths using CDC FluSurv-Net definitions), outpatient cases (influenza-like illness from Germwatch) and inpatient cases (influenza-related hospitalizations from FluSurv-NET).

  • Thresholds for severity are calculated based on historical data.
  • Season severity is increased when thresholds for two of the three indicators are exceeded.
  • Calculations were performed using The Moving Epidemic Method R Package (‘mem’).
  • Germwatch is a program from Intermountain Healthcare to help caregivers and consumers track and treat illnesses in the community, and provides outpatient case levels for the severity index.

Low

Current Weekly Severity

Moderate

Season Severity Metric

Outcomes Following Hospitalization with Influenza
0-45-2425-4950-6465+051015**********0-45-2425-4950-6465+0-45-2425-4950-6465+
Age Category0-45-2425-4950-6465+Age CategoryPercent of Hospitalizations with Outcome`% ICU Admission``% requiring Mechanical Ventillation``% with Pneumonia`
A double asterisk (**) indicates that a column has been suppressed due to low counts. If a column has is empty without a suppression mark it indicates that no cases of that category have been detected this season.

Pneumonia, Influenza, and COVID Mortality (PIC)

Pneumonia, Influenza or COVID-19 (PIC) Mortality is the number of decedents in a MMWR week with Pneumonia, Influenza, or COVID-19 listed on their death certificates divided by the total number of decedents in a MMWR multiplied by 100 in order to get a percent of all deaths due to PIC.

2024-2025 Season: Pneumonia, Influenza, and COVID Mortality for Salt Lake County

Current Season
Jan 2023Jul 2023Jan 2024Jul 2024Jan 202505101520
Observed PIC PercentPredicted Previous PICUpper Bound of Predicted PIC2024-2025 Season: Pneumonia, Influenza, and COVID Mortality for Salt Lake County% of All Deaths Due to PIC

Historical Pneumonia, Influenza, and COVID Morality for Salt Lake County Thresholds

Since 2015-2016
2020202220242468101214161820
Observed PIC PercentPredicted Previous PICUpper Bound of Predicted PICHistorical Pneumonia, Influenza, and COVID Morality for Salt Lake County Thresholds% of All Deaths Due to PIC


US indicators used for severity assessment include outpatient cases (influenza-like illness from ILINET), inpatient cases (influenza-related hospitalizations from FluSurv-NET) and deaths (influenza and pneumonia related deaths from NCHS).