Colorado State Reportable Tick-Borne Diseases

Colorado Tick Fever is the most commonly diagnosed tick-borne illness in Colorado. In addition, Tularemia, Q-fever, Rocky Mountain Spotted-Fever, and Tick-Borne Relapsing Fever have been also been reported in Colorado.

The CDC reports only 17 cases of Lyme disease in Colorado since 1990 with the Colorado Department of Public Health and Environment stating that none of the exposures originated in Colorado. Four of these cases were reported in 2017, the highest annual report on record for Colorado.  However, the CDC also states that there are limitations of surveillance data and problems with under-reporting for this disease.

Many tick-borne diseases that occur within the US in both humans and pets are not reportable within Colorado, so incidence and prevalence are difficult to monitor.  The Colorado Department of Health and Environment has stated that “since so many of these diseases manifest as febrile illness with a non-specific constellation of symptoms that, yes, we believe they are routinely under reported. However, we believe that is because they are difficult to diagnose.” Reporting also depends on laboratory capabilities, which are unreliable or unavailable in some cases, as well as compliance with Regulation 6 CCR 1009-1, which are the rules and regulations pertaining to epidemic and communicable disease control.

Tick-Borne Diseases required to be reported by Physician or Laboratory by Colorado Department of Public Health and Environment as of June 14,  2019 include: