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Dermacentor variabilis, also known as the American dog tick or wood tick, is a species of tick that is known to carry bacteria responsible for several diseases in humans, including Rocky Mountain spotted fever and tularemia (Francisella tularensis). It is one of the best-known hard ticks. Diseases are spread when it sucks blood from the host.
A typical Rhipicephalus species is Rhipicephalus sanguineus, the tropical dog tick, specialized to feed only on dogs. It is distributed globally throughout the warm countries, wherever humans with their dogs live. Typical Rhipicephalus species that feed on cattle in Africa are R. appendiculatus, the brown ear-tick, and R. evertsi, the red ...
Dogs and medium-sized mammals are the preferred hosts of an adult American dog tick, although it feeds readily on other large mammals, including human beings. This tick is the most commonly identified species responsible for transmitting R. rickettsii to humans. Rocky Mountain wood ticks (D. andersoni) are found in the Rocky Mountain states and ...
Tick species are widely distributed around the world. [58] They tend to flourish more in warm, humid climates, because they require a certain amount of moisture in the air to undergo metamorphosis, and low temperatures inhibit their development of eggs to larvae. [59] The occurrence of ticks and tick-borne illnesses in humans is increasing. [60]
Ticks and lice form another large group of invertebrate vectors. The bacterium Borrelia burgdorferi, which causes Lyme Disease, is transmitted by ticks and members of the bacterial genus Rickettsia are transmitted by lice. For example, the human body louse transmits the bacterium Rickettsia prowazekii which causes epidemic typhus.
Dogs that are severely affected can die from this disease. Although people can get ehrlichiosis, dogs do not transmit the bacteria to humans; rather, ticks pass on the ehrlichia organism. Clinical signs of human ehrlichiosis include fever, headache, eye pain, and gastrointestinal upset.
What they look like: Chiggers, a type of small mite, typically leave clusters of bites. If you have chigger bites, they'll be small, red and likely quite itchy.Chigger bites may also look like ...
Humans are not the preferred natural host, but the adult ticks, containing the bacterium known to cause Lyme disease, can attach to humans and allow for transmission of the bacterium. [5] Ticks are found around the world, with suggestions that climate change and globalization of travel and commerce may be broadening their scope of residence. [6]