With its abdomen engorged with a host blood meal, this image depicts a lateral, or side view of a female blacklegged, or deer tick, Ixodes scapularis.
The blacklegged or deer tick, Ixodes scapularis, transmits Lyme disease, a disease caused by a spiral shaped bacterial microbe, Borrelia burgdorferi. This disease is known from Europe, Africa, Asia, and in almost all the United States. It is especially common in the Northeast, in Minnesota and in northern California. This larval tick is no bigger than the size of the period at the end of this sentence.
Credit: CDC/ Dr. Gary Alpert - Urban Pests - Integrated Pest Management (IPM)