Lincoln-Lancaster County Health Department

Overview: These dashboards show trends in Lancaster County, Nebraska for influenza (flu), respiratory syncytial virus (RSV), adenovirus, parainfluenza, rhinovirus/enterovirus (RVEV), coronavirus, human metapneumovirus, and parapertussis. The data on these dashboards help us monitor early signs of disease spread, virus variants or subtypes occurring in Lancaster County.

Respiratory Virus Seasons: Respiratory virus activity typically begins to increase in the fall and continues through the winter.

Laboratory Tests: We monitor laboratory tests to understand how many tests are being performed and what percent of tests that are positive for a respiratory virus to understand if activity is increasing or decreasing. Laboratory tests are attributed to specimen collection date.

Dashboard Update Frequency: This dashboard will be updated once a week.


Influenza (flu) is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and lungs. There are two main types of influenza (flu) viruses: types A and B. The influenza A and B viruses that routinely spread in people (human influenza viruses) are responsible for seasonal flu epidemics each year.

Click here for national influenza data

Click here for the Nebraska DHHS respiratory illness dashboard

YEARTotal TestsPositivesPercent Positivity

The charts below use the weeks with a starting date of Sunday through the following Saturday. Week numbers are representative of those weeks in each year.

Additional Influenza Details

Influenza Type/Subtype: Influenza, commonly referred to as the flu, is a respiratory illness caused by influenza viruses. There are two main types of influenza virus, types A and B. Test results may include the Type (Type A, Type B) or the virus subtype (such as H3N2), which helps determine the specific virus strains circulating in Lancaster County.

Click here for the weekly national (CDC) influenza surveillance data.

YearTotal TestsPositive TestsA/BH1/H3Test Type
2024114991948A: 1067/11491
B: 883/11281
H1: 22/1067
H3: 281/1067
PCR: 661/4109
Antigen: 1295/7688
202318273807A: 609/18261
B: 192/17924
H1: 52/609
H3: 144/609
PCR: 268/10065
Antigen: 545/8862
2022289153125A: 2936/28900
B: 185/28542
H1: 581/2936
H3: 545/2936
PCR: 1466/16524
Antigen: 1669/13554
202118029313A: 274/18027
B: 39/17902
H1: 40/274
H3: 30/274
PCR: 149/15317
Antigen: 174/2906
2020102981278A: 684/10280
B: 597/9957
H1: 58/684
H3: 1/684
PCR: 256/5973
Antigen: 1067/5154
2019104931377A: 1237/9803
B: 141/9617
H1: 28/1237
H3: 59/1237
PCR: 223/4015
Antigen: 1182/7213
201880821643A: 1350/7554
B: 296/5052
H1: 5/1350
H3: 0/1350
PCR: 221/1171
Antigen: 1440/7264

Age Overview for Influenza

The information displayed below highlights age. Further demographic stratification may be added in the future.


Negative laboratory test reporting requirements affect percent positivity

Most negative laboratory tests are not required to be reported per Title 173 Nebraska Administrative Code (NAC) regulations for communicable disease reporting as established through the Nebraska State Legislature. Click the link below to see Title 173 Chapter 1 of the Nebraska rules & regulations governing these requirements. The negative laboratory tests for influenza and respiratory syncytial virus (RSV) are required to be reported by laboratories submitting data electronically, which means percent positivity (the percent of tests that detected the pathogen, out of all tests reported) is more likely to be accurate for influenza and RSV than other respiratory pathogens.

Click here for Title 173 Rules & Regulations PDF

Disclaimer: When interpreting these data, it is important to recognize that laboratory-based surveillance systems are unique laboratory results and are not considered individual cases. For this reason, laboratory-based surveillance systems have a number of limitations, including, but not limited to: underreporting, sampling bias, reporting lags, and lack of integration with epidemiological information. Reporting of influenza, RSV, parainfluenza, rhinovirus/enterovirus, coronavirus (non-COVID-19), human metapneumovirus and parapertussis conditions are only required by laboratories performing electronic lab reporting per 173 NAC 1-005.02C; additionally, only negative laboratory results for influenza and RSV are required to be reported by laboratories performing electronic lab reporting per 173 NAC 1-005.02C. Percent positivity may not be representative of transmission in Lancaster County as a result.

Data are subject to change

All data are preliminary and subject to change as we update data. Laboratory test results reflect unique encounters, and counts do not necessarily reflect unique persons.


  • RSV: Respiratory syncytial virus
  • RVEV: Rhinovirus/enterovirus
  • Seasonal coronavirus: Refers to HCoV-NL63, HCoV-229E, HCoV-OC43 and HCoV-HKU1. This count does not include SARS-CoV2.
  • NEDSS: Nebraska Electronic Disease Surveillance System
  • ILI: Influenza-like illness