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Volume 10, Number 8—August 2004
Dispatch

Spotted-Fever Group Rickettsia in Dermacentor variabilis, Maryland

Nicole C. Ammerman*, Katherine I. Swanson*, Jennifer M. Anderson*, Timothy R. Schwartz*, Eric C. Seaberg*, Gregory E. Glass*, and Douglas E. Norris*Comments to Author 
Author affiliations: *Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA

Main Article

Table 2

Univariate odds ratio (OR) associated with any Rickettsia organism and with R. montanensis

Variable Rickettsia genus–positive
R. montanensis–positive
OR 95% CIa p value OR 95% CI p value
Sex






Female
1.0
reference

1.0
reference

Male
0.94
0.41–2.16
0.890
0.98
0.35–2.75
0.967
County of collection






Baltimore
1.02
0.29–3.57
0.969
0.57
0.16–2.09
0.397
All other counties
1
reference

1.0
reference

Month collected:






April
1.0
reference

1.0
reference

May
0.96
0.30–3.12
0.951
0.37
0.08–1.84
0.227
June
0.52
0.11–2.58
0.425
0.26
0.03–2.13
0.209
July/August 4.14 1.49–11.47 0.006 1.87 0.57–6.16 0.301

aCI, confidence interval.

Main Article

Page created: March 01, 2011
Page updated: March 01, 2011
Page reviewed: March 01, 2011
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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