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Numbers of unambiguous IGS sequences recovered from bird-derived Ixodes scapularis larvae and host-seeking I. scapularis nymphs. Map shading represents areas of highest (red) and lowest (green) predicted risk of I. scapularis-borne disease (data from Diuk-Wasser et al. [6]). One bird sampling site (Pierre, SD), from which no B. burgdorferi-infected larvae were recovered, is not shown.
