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Tick Tick micrograph Diagram of the life cycle of the black-legged tick (Ixodes scapularis), showing seasonal stages from engorged female laying eggs in spring, larva and nymph stages feeding on animal and human hosts in summer, and adult ticks on hosts in fall and winter. Arrows indicate progression through each stage, with illustrations of ticks and typical hosts such as deer, horses, dogs, and humans. Close-up of a female American dog tick with a reddish-brown body and pale markings, clinging to a green plant stem. A detailed illustration of a black-legged tick or deer tick (Ixodes scapularis), showing its reddish-brown oval body and eight segmented legs spread outward.
Learn how scientists are targeting the glands required for tick digestion to prevent the spread of disease
Cattle tick Tiny tick Tick-borne disease cases in the United States Rocky Mountain wood tick
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Images

Tick
The brown dog tick (Rhipicephalus sanguineus) can transmit Rocky Mountain...
James Gathany and William Nicholson/Centers for Disease Control and Prevention (CDC) (Image ID: 7646)
Tick micrograph
Environmental scanning electron microscope image of a tick. Clearly visible is the...
© Sarah Swanson
Tick life cycle
The life cycle of the hard tick Ixodes scapularis, a carrier of the bacterium...
Encyclopædia Britannica, Inc.
Dog tick
The American dog tick (Dermacentor variabilis) is a household pest.
© Paul Lemke/Dreamstime.com
Black-legged tick
Illustration of a black-legged, or deer, tick (Ixodes scapularis).
Encyclopædia Britannica, Inc.
Cattle tick
An engorged cattle tick (Rhipicephalus).
E.R. Degginger/Encyclopædia Britannica, Inc.
Tiny tick
A male lone star tick (Amblyomma americanum) standing in the palm of a hand....
© Zeke Churchin
Rocky Mountain wood tick
Dorsal view of a female Rocky Mountain wood tick (Dermacentor andersoni),...
James Gathany—Dr. Christopher Paddock/CDC

Interactives

Tick-borne disease cases in the United States
Map depicting trends in tick populations and incidence of various tick-borne diseases.
Encyclopædia Britannica, Inc.
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