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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

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