2023 Colorado Annual Zoonoses Report
Report | Year | Five-year average |
| 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | Anthrax | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Brucellosis | 3 | 2 | 1 | 1 | 2 | 2 | 1 | Chikungunya | 0 | 2 | 1 | 3 | 3 | 2 | 12 | Colorado Tick Fever | 1 | 4 | 1 | 2 | 1 | 2 | 2 | Dengue | 9 | 32 | 4 | 4 | 14 | 13 | 20 | Hantavirus | 5 | 1 | 1 | 3 | 0 | 2 | 2 | Lyme disease** | 2 | 8 | - | - | - | - | - | Malaria | 23 | 38 | 11 | 18 | 20 | 22 | 48 | Plague | 0 | 0 | 2 | 1 | 0 | 1 | 2 | Psittacosis | 1 | 0 | 0 | 0 | 0 | 0 | 0 | Q-Fever, Acute | 9 | 3 | 0 | 7 | 3 | 4 | 0 | Q-Fever, Chronic | 0 | 2 | 2 | 0 | 0 | 1 | 0 | Rabies, Human | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Rabies, Animal | 325 | 163 | 92 | 84 | 70 | 147 | 56 | Spotted Fever Group Rickettsioses (including RMSF) | 7 | 4 | 2 | 3 | 2 | 4 | 2 | Tick-borne Relapsing Fever | 1 | 1 | 3 | 2 | 1 | 2 | 3 | Tularemia | 6 | 6 | 1 | 3 | 3 | 4 | 9 | West Nile Virus | 96 | 122 | 35 | 175 | 206 | 127 | 630 | Zika | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
*Case counts represent residence in Colorado at time of diagnosis and do not indicate where the patient was infected with the indicated disease. ** Lyme disease investigations were on hold due to limited capacity during the pandemic.
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