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Volume 13, Number 7—July 2007

Letter

Zoonotic Pathogens in Ixodes scapularis, Michigan

Sarah A. Hamer*Comments to Author , Pamela L. Roy*, Graham J. Hickling†, Edward D. Walker*, Erik S. Foster‡, Christina C. Barber*, and Jean I. Tsao*
Author affiliations: *Michigan State University, East Lansing, Michigan, USA; †University of Tennessee, Knoxville, Tennessee, USA; ‡Michigan Department of Community Health, East Lansing, Michigan, USA;

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Table

Prevalence of 3 pathogens in Ixodes scapularis ticks from 2 Michigan field sites, spring 2006*

Site Life stage No. 
I. scapularis No. ticks infected or co-infected (%)
Borrelia burgdorferi Anaplasma phagocytophilum Babesia odocoilei B. burgdorferi
 and A. phagocytophilum B. burgdorferi and B. odocoilei
E-1 A 16 9 (56.3) 1 (6.3) 1 (6.3) 1 (6.3) 0
E-2 A 12 8 (66.7) 3 (25.0) 1 (8.3) 1 (8.3) 1 (8.3)
N 1 1 (100.0) 0 0 0 0
I-1 A 4 2 (50.0) 0 0 0 0
N 2 0 1 (50.0) 0 0 0
I-2 A 18 9 (50.0) 0 1 (5.6) 0 1 (5.6)
N 8 2 (25.0) 1 (12.5) 0 1 (12.5) 0
I-3 A 69 32 (46.4) 1 (1.4) 3 (4.3) 0 3 (4.3)
All endemic sites A 28 17 (60.7) 4 (14.3) 2 (7.1) 2† (7.1) 1† (3.6)
N 1 1 (100) 0 0 0 0
All invaded sites A 91 43 (47.3) 1 (1.1) 4 (4.4) 0 4‡ (4.4)
N 10 2 (20.0) 2 (20.0) 0 1† (10.0) 0

*E, endemic site; A, adult: N, nymph; I, invaded site.
†Nonsignificant level of co-infection; p = 0.378–0.640, by Fisher exact test.
‡Significant level of co-infection; p = 0.046, by Fisher exact test.

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