19 Invasive Haemophilus influenzae

CDC Haemophilus influenzae page

24 cases

8 deaths

95.8 % of cases were hospitalized

1.9 cases per 100,000 population


19.1 Epidemiologic Review

19.1.1 Disease Information

Overview: Haemophilus influenzae is a bacterial pathogen that can result in severe infections, particularly in infants. Syndromes as a result of an H. influenzae infection include bacteremia (infection in the blood), meningitis (infection in the brain and spinal cord) or pneumonia.

Symptoms: Depending on the syndrome caused as a result of H. influenzae, symptoms can include fever, chills, nausea, diarrhea, shortness of breath, abdominal pain, chest pain, headache and fatigue.

Transmission: H. influenzae is transmitted person-to-person by droplets or direct contact with an infected person.

Treatment: Antibiotics are the most common form of treatment for all syndromes.

Prevention Vaccine is available for type B (Hib). Routine childhood vaccinations are the best measure to prevent the disease.

19.1.2 Demographics


Rates for <1, 1-4, 5-17, and 18-29 years of age are not displayed due to low case counts.


Race Rate per 100k
, Non Hispanic <5 cases
Asian, Non Hispanic <5 cases
Black or African American, Non Hispanic <5 cases
Hispanic or Latino 2
Other Race, Non Hispanic <5 cases
Unknown Race and Ethnicity <5 cases
White, Non Hispanic 1.5
American Indian or Alaska Native, Non Hispanic <5 cases
Native Hawaiian or Other Pacific Islander, Non Hispanic <5 cases
Two or More Races, Non Hispanic <5 cases


Racial and Ethnicity demographic data are not presented due to low counts.


19.1.3 Outbreaks

No outbreaks were identified in 2023.

19.1.4 Monthly and Historical Comparisons




Data for Utah and the CDC were retrieved from the CDC’s Notifiable Infectious Disease Data Tables.

19.2 Key Things to Know

  • Cases of H. influenzae had several comorbidities, including 10 cases (41%) diagnosed with obesity, 9 cases (37.5%) diagnosed with diabetes, 8 cases (33%) diagnosed with cardiovascular health problems, and 7 cases (29%) diagnosed with chronic lung disease.
  • 11 cases (48%) were admitted to the ICU, 5 cases (25%) were given medications to help increase blood pressure, and 6 cases (26%) were intubated.
  • 19 cases (79%) had bacteria in their blood stream (bacteremia) during their infection.
  • Of all H. influenzae cases in 2023, 22 people (92%) were unvaccinated (Hib vaccine). Additional risk factors include smoking, drug use, and experiencing homelessness.