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Volume 4, Number 2—June 1998

Perspective

Rickettsial Pathogens and Their Arthropod Vectors

Abdu F. Azad*Comments to Author  and Charles B. Beard†
Author affiliations: *University of Maryland School of Medicine, Baltimore, Maryland, USA; †Centers for Disease Control and Prevention, Atlanta, Georgia, USA

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Table 3

Species composition of tick-borne rickettsiae isolated from hemolymph-positive Dermacentor ticksa

Rickettsial sp California
D. occidentalis
(No. isolates) Montana
D. andersoni
(No. isolates) Ohio
D. variabilis
(No. isolates) Long Island
D. variabilis
(No. isolates) Maryland
D. variabilis
(No. isolates)
R. rickettsii 0 (0) 9 (10) 18 (4) 0 (0) 8 (2)
R. rhipicephali 96 (79) 44 (47) 0 (0) 0 (0) 0 (0)
R. montana 7 (8) 59 (13) 100 (100) 0 (0)
Other SFGb 5 (1)c 88 (23)d
R. bellii 4 (3) 39 (41) 18 (4) 0 (0) 4 (1)
Total number isolates 82 106 22 100 26

aShows a compilation of various statewide surveys, comparing the species composition of SFG rickettsiae in Dermacentor spp. ticks that tested positive by immunofluorescence assay.
bSFG, spotted fever group.
cR. amblyommii.
dMouse anti-sera made against Maryland isolates reacted with WB-8-2 (unnamed SFG rickettsiae).

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