Ticks are external parasites, living by feeding on the blood of mammals, birds, and sometimes reptiles and amphibians. The timing of the origin of ticks is uncertain, though the oldest known …

Learn where ticks live, how to prevent tick bites, and what to do after a tick bite. Homepage for CDC's website about ticks and tickborne diseases.

The following is a list of all of the major tick-borne diseases, the usual tick vector (s) or common ticks, and the pathogen (s) of the tick species that, if known, transmits them in the United States.

Oct 8, 2025 · A tick is any of about 970 species of parasitic invertebrates in the order Ixodida. Ticks are important parasites of large wild and domestic animals and are also significant …

There are two families of ticks found in the United States: Ixodidae (hard ticks) and Argasidae (soft ticks). Of the 700 species of hard ticks and 200 species of soft ticks found throughout the …

Jul 24, 2025 · In this article, we help you identify ticks and tick bites, along with the symptoms of tick-borne illnesses, and learn what to do if a tick bites you.

Nov 14, 2023 · Most tick bites are painless or cause only minor symptoms, such as a change in skin color. But the bite from some ticks can be serious. In the United States, the number of …

Oct 13, 2024 · It spreads from the bite of a dog tick, wood tick, or lone star tick in many parts of the country. The most common symptoms are a high fever, swollen glands, sore throat, and …

Jun 23, 2025 · The risks of getting a tick-borne disease like Lyme or relapsing fever vary by region, depending on what ticks are around, what they're carrying, and how likely they are to …

Tick bites can sometimes spread dangerous diseases, like Lyme disease and Rocky Mountain spotted fever. You can reduce your risk of tick bites by wearing bug spray, covering your skin …