DISEASE INVESTIGATION
Epidemiologists collect and analyze data to help keep our communities healthy and reduce the spread of communicable diseases. They work closely with healthcare providers, and the process of monitoring a reportable disease begins when a patient seeks care. Once a patient is tested and receives a positive result, the healthcare provider informs the local public health department, and we then contact the patient to provide education, guidance, and resources to help slow or stop the spread of the disease. For information on specific diseases commonly found in Southwest Utah, please see our pages on COVID-19, Influenza (Flu), Measles, Rabies, Tuberculosis, Valley Fever, and West Nile Virus, each of which offers community-focused guidance and prevention tips.
SOUTHWEST UTAH DISEASE INCIDENCE RATES
Our epidemiologists monitor disease trends to help detect outbreaks, clusters, and changes over time. The table below highlights the 15 most commonly reported diseases in the Southwest Utah Public Health District and shows how incidence rates changed between 2024 and 2025.
Understanding the Incidence Rate:
- Incidence is the number of new cases in a population over one year.
- The incidence rate is calculated as the number of cases per 100,000 people.
| Rank | Disease | 2024 Rate (per 100k) | 2025 Rate (per 100k) | Trend |
|---|---|---|---|---|
| 1 | Influenza (Seasonal) | 879 | 784 | Decreasing ▼ |
| 2 | Coronavirus, Novel (2019-nCoV) | 911 | 413 | Decreasing ▼ |
| 3 | Respiratory Syncytial Virus (RSV) | 235 | 244 | Similar ➔ |
| 4 | Chlamydia trachomatis infection | 195 | 169 | Decreasing ▼ |
| 5 | Norovirus | 105 | 96 | Similar ➔ |
| 6 | Measles (Rubeola) | 0 | 42 | Increasing ▲ |
| 7 | Coccidioidomycosis | 22 | 22 | Similar ➔ |
| 8 | Tuberculosis, Latent Infection (LTBI) | 12 | 21 | Increasing ▲ |
| 9 | Hepatitis C virus infection, chronic | 14 | 19 | Increasing ▲ |
| 10 | Gonorrhea | 17 | 15 | Similar ➔ |
| 11 | Salmonellosis | 14 | 15 | Similar ➔ |
| 12 | Campylobacteriosis | 12 | 15 | Increasing ▲ |
| 13 | Pertussis | 6 | 13 | Increasing ▲ |
| 14 | Syphilis | 10 | 8 | Decreasing ▼ |
| 15 | Shiga toxin-producing Escherichia coli | 2 | 8 | Increasing ▲ |
On smaller screens, scroll horizontally to view the full table.
Trend Key: ▲ Increasing ▼ Decreasing ➔ Similar

