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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 4

Laboratory testing for Colorado tick fever virus infection performed on specimens from Montana, USA, 2011–2020*

Year Assay No. tests performed No. (%) tests positive
2011 IFA 90 0
2012 IFA 141 2 (1.4)
2013 IFA 168 0
2014 IFA 143 2 (1.4)
2015 IFA 199 4 (2.0)
2016 IFA 120 3 (2.5)
2017 IFA 172 4 (2.3)
2018 IFA 208 3 (1.4)
2019
IFA
170
3 (1.8)
2020 RT-PCR 84 18 (21.4)
PRNT 53 3 (5.7)
Total 137 21 (15.3)

*IFA, indirect immunofluorescence assay for IgG; PRNT, plaque-reduction neutralization test; RT-PCR, reverse transcription PCR.

Main Article

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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