Cases reported "Colorado Tick Fever"

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1/2. colorado tick fever: clinical, epidemiologic, and laboratory aspects of 228 cases in Colorado in 1973-1974.

    During 1973 and 1974, we looked for cases of colorado tick fever throughout Colorado; 228 cases were identified. Although 90% of the patients reported exposure to ticks before illness, only 52% were aware of an actual tick bite. Typical symptoms of fever, myalgia, and headache were common, but gastrointestinal symptoms were also prominent in 20% of the patients. Twenty percent were hospitalized; no deaths or permanent sequelae were noted. Persistent viremia (greater than or equal to 4 weeks) was found in about half of the cases; this finding was not associated with the occurrence of prolonged symptoms (greater than or equal to 3 weeks), which were also reported in half of the cases. One patient became reinfected with the virus. Increasing tourism in endemic areas and the frequent occurrence of prolonged or biphasic illnesses provide the potential for patients with colorado tick fever to seek medical care anywhere in the united states.
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2/2. colorado tick fever in a resident of new york city.

    When a traveler returns from abroad with a febrile illness, clinicians appropriately concern themselves with a potentially vast array of diagnostic exotica. The patient we describe herein did not leave the united states but nevertheless posed the same clinical dilemma after returning home to new york city from the western united states. This case of colorado tick fever, acquired on the utah-Colorado border and first expressed in Manhattan, serves as a useful reminder of the importance of taking a careful travel history for national as well as international travelers.
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