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Volume 29, Number 9—September 2023
CME ACTIVITY - Synopsis

Characteristics of Hard Tick Relapsing Fever Caused by Borrelia miyamotoi, United States, 2013–2019

David W. McCormick, Catherine M. Brown, Jenna Bjork, Kim Cervantes, Brenda Esponda-Morrison, Jason Garrett, Natalie Kwit, Abigail Mathewson, Charles McGinnis, Marco Notarangelo, Rebecca Osborn, Elizabeth Schiffman, Haris Sohail, Amy M. Schwartz, Alison F. Hinckley, and Kiersten J. KugelerComments to Author 
Author affiliations: Centers for Disease Control and Prevention, Fort Collins, Colorado, USA (D.W. McCormick, A.M. Schwartz, A.F. Hinckley, K.J. Kugeler); Massachusetts Department of Public Health, Boston, Massachusetts, USA (C.M. Brown); Minnesota Department of Health, Minneapolis, Minnesota, USA (J. Bjork, E. Schiffman); New Jersey Department of Health, Trenton, New Jersey, USA (K. Cervantes); Connecticut Department of Public Health, Hartford, Connecticut, USA (B. Esponda-Morrison); Rhode Island Department of Health, Providence, Rhode Island, USA (J. Garrett, C. McGinnis); Vermont Department of Health, Burlington, Vermont, USA (N. Kwit); New Hampshire Department of Health and Human Services, Concord, New Hampshire, USA (A. Mathewson, M. Notarangelo); Wisconsin Department of Health Services, Madison, Wisconsin, USA (R. Osborn); Maine Center for Disease Control and Prevention, Augusta, Maine, USA (H. Sohail)

Main Article

Table 1

Demographic characteristics for confirmed and possible cases of hard tick relapsing fever caused by Borrelia miyamotoi identified by public health surveillance, United States, 2013–2019*

Characteristic Confirmed, n = 166 Possible, n = 134 p value
Median age, y (range)†
 56 (4–86)
 50 (1–86)
 0.03‡
Categorical age
<18 15/166 (9) 5/134 (4)
18–65 95/166 (57) 101/134 (75) 0.004
>65
 56/166 (34)
 28/134 (21)
Sex
M 92/166 (56) 65/134 (49) 0.23
F
 74/166 (44)
 69/134 (51)
Year of illness onset§
2013 8/165 (5) 0/132 (0)
2014 9/165 (5) 1/132 (1)
2015 1/165 (1) 8/132 (6)
2016 16/165 (10) 10/132 (8) <0.0001¶
2017 56/165 (34) 22/132 (17)
2018 38/165 (23) 44/132 (34)
2019 37/165 (22) 46/132 (35)

*Values are no. positive/no. tested (%) unless indicated otherwise. †Missing information for 25 persons. ‡By Wilcoxon rank-sum test. §Missing information for 4 persons. ¶By Fisher exact test.

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Page created: July 06, 2023
Page updated: August 18, 2023
Page reviewed: August 18, 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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