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Table 1 Percent positive test results (number positive/number tested) by region for dogs tested from 2010 – 2012 in the United States for antigen of Dirofliaria immitis and antibody to Borrelia burgdorferi , Ehrlichia spp., and Anaplasma spp.

From: Canine infection with Dirofilaria immitis, Borrelia burgdorferi, Anaplasma spp., and Ehrlichia spp. in the United States, 2010–2012

State Dirofilaria immitis Borrelia burgdorferi Ehrlichia spp. Anaplasma spp.
Northeast 0.4% (11,675/3,175,080) 13.3% (373,212/2,806,273) 0.9% (24,011/2,806,112) 7.1% (189,486/2,652,801)
Midwest 0.7% (20,014/2,817,915) 4.4% (76,025/1,720,510) 1.0% (17,337/1,720,168) 3.9% (59,580/1,548,686)
Southeast 2.9% (101,850/3,562,190) 2.5% (51,232/2,058,574) 3.2% (65,191/2.057,984) 0.9% (14,046/1,631,332)
West 0.8% (8,887/1,178,947) 1.4% (5,726/410,840) 1.3% (5,134/410,419) 2.0% (7,056/359,449)
Overall mean 1.3% (142,426/10,734,132) 7.2% (509,195/6,996,197) 1.6% (111,673/6,994,683) 4.4% (270,168/6,192,268)