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Volume 29, Number 3—March 2023
Research

Increase in Colorado Tick Fever Virus Disease Cases and Effect of COVID-19 Pandemic on Behaviors and Testing Practices, Montana, 2020

Raymond A. Soto, Erika Baldry, Grace M. Vahey, Jennifer Lehman, Margaret Silver, Amanda Panella, Aaron C. Brault, Holly R. Hughes, Kelly A. Fitzpatrick, Jason Velez, Brad J. Biggerstaff, Brent Wolff, Jean Randolph, Laird J. Ruth, J. Erin Staples, and Carolyn V. GouldComments to Author 
Author affiliations: Centers for Disease Control and Prevention, Fort Collins, Colorado, USA (R.A. Soto, G.M. Vahey, J. Lehman, M. Silver, A. Panella, A.C. Brault, H.R. Hughes, K.A. Fitzpatrick, J. Velez, B.J. Biggerstaff, J.E. Staples, C.V. Gould); Montana Department of Health and Human Services, Helena, Montana, USA (E. Baldry); Centers for Disease Control and Prevention, Atlanta, Georgia, USA (B. Wolff, J. Randolph, L.J. Ruth)

Main Article

Table 1

Demographic characteristics of participants in a Colorado tick fever case–control study, Montana, USA, 2020*

Characteristic Case-patients, n = 14 Controls, n = 22 OR (95% CI)
Sex
M 10 (71) 12 (55) 2.1 (0.5–8.3)
F
 4 (29)
 10 (45)
 0.5 (0.1–2.0)
Age group, y
<21 5 (36) 4 (18) 2.5 (0.6–11.0)
21–44 3 (21) 10 (45) 0.3 (0.1–1.4)
45–64 5 (36) 5 (23) 1.9 (0.4–7.9)
>65 1 (7) 3 (14) 0.5 (0.1–3.9)
Median age, y (range)
 26 (1–70)
 33 (7–84)
 NA
Race
White
 14 (100)
 22 (100)
 0.6 (0.4–11.7)
Ethnicity
Non-Hispanic or non-Latino 12 (86) 17 (77) 1.8 (0.3–9.2)
Hispanic or Latino 1 (7) 3 (14) 0.5 (0.1–3.9)
Other
 1 (7)
 2 (9)
 0.8 (0.1–6.7)
Underlying medical condition
None 11 (79) 13 (59) 2.5 (0.6–10.8)
Immunosuppressive condition or medication 0 2 (9) 0.3 (0.0–3.6)
Diabetes mellitus 0 2 (9) 0.3 (0.0–3.6)
Cardiovascular disease 1 (7) 3 (14) 0.5 (0.1–3.9)
Cancer 0 1 (5) 0.1 (0.0–1.3)
Other
 2 (14)
 2 (9)
 1.7 (0.3–10.9)
SARS-CoV-2 testing during illness
Tested 6 (43) 7 (32) 1.6 (0.4–6.3)
Positive 0 0 1.6 (0.1–28.1)

*Values are no (%) except as indicated. NA, not applicable; OR, odds ratio.

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Page created: December 27, 2022
Page updated: February 19, 2023
Page reviewed: February 19, 2023
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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