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  • Laboratory Confirmed Influenza

    The North Dakota Department of Health mandates that all laboratory confirmed influenza be reported to the state health authorities. The testing methods reported include PCR, DFA/IFA, culture and rapid positive results. Below is a representation of the positive results by week by influenza virus type and subtype.

    Outpatient Illness Surveillance

    North Dakota Outpatient Influenza-like Illness Surveillance Network (ILINet) providers report weekly the number of patients seen in their practice the week prior that presented with fever & cough/sore throat over the total number of patients seen. Below is the representation of the total proportion of patients weekly with ILI. The baseline level for seasonal ILI is approximately 1.3%.

    Sentinel Laboratory Surveillance

    Select North Dakota laboratories report not only the positive influenza reports, but also the total number of tests run for the week. This allows the North Dakota Department of Health to assess the percent positivity of influenza & RSV tests. When the percent positivity increases, so does the likelihood that the rapid influenza tests are more accurate at detecting influenza or RSV.

    Sentinel School Surveillance

    Select North Dakota Schools report weekly the number of students out ill over the number of students currently enrolled. This surveillance tool has shown to be an indicator of the beginning of influenza season as school aged children are the most commonly infected age group when it comes to influenza disease.

    Pneumonia & Influenza Deaths

    Pneumonia & influenza consistently rank within the top 10 leading causes of death in North Dakota. Below is a graph representing the number of deaths that have ICD codes relating to all influenza & pneumonia (J09-J18) as well as a trend for codes relating specifically to influenza (J09-J10). Note that the number of confirmed deaths due to influenza may be different than the number of deaths reported here due to the fact that not all influenza cases are laboratory diagnosed and physician diagnosed cases are not reportable to the state health department.