Demma et al. 353 (6): 587, Figure 1 August 11, 2005

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Figure 1. The Principal Recognized Tick Vectors of Rickettsia rickettsii.

Panel A shows Dermacentor variabilis, or the American dog tick, Panel B D. andersoni, or the Rocky Mountain wood tick, and Panel C Rhipicephalus sanguineus, or the brown dog tick. The scale bar in each image represents 2 mm. All ticks shown are adult females, which represent the largest developmental stage; males, nymphs, and larvae are progressively smaller. R. rickettsii may be transmitted by ticks at all stages of development.