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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.
Lyme disease, also known as Lyme borreliosis, is a tick-borne disease caused by species of Borrelia bacteria, transmitted by blood-feeding ticks in the genus Ixodes. [4] [9] [10] The most common sign of infection is an expanding red rash, known as erythema migrans (EM), which appears at the site of the tick bite about a week afterwards. [1]
Here's why you should practice tick safety, even during the cold months. While ticks may not be on your mind during winter, they probably should be. Here's why you should practice tick safety ...
Lyme disease is spread to humans through the bite of infected ticks.The tick population is affected by weather and climate.Many factors determine tick population densities as well as diseased population densities of ticks so that no single factor can determine likelihood of exposure to tick-borne disease. [1]
Tick-borne diseases, which afflict humans and other animals, are caused by infectious agents transmitted by tick bites. [1] They are caused by infection with a variety of pathogens , including rickettsia and other types of bacteria , viruses , and protozoa . [ 2 ]
Tick paralysis is believed to be due to toxins found in the tick's saliva that enter the bloodstream while the tick is feeding. The two ticks most commonly associated with North American tick paralysis are the Rocky Mountain wood tick (Dermacentor andersoni) and the American dog tick (Dermacentor variabilis); however, 43 tick species have been implicated in human disease around the world. [1]
The lifecycle of Dermacentor variabilis and Dermacentor andersoni ticks (family Ixodidae) American dog tick (Dermacentor variabilis) range Rocky Mountain wood tick (Dermacentor andersoni) range. Ticks are the natural hosts of the disease, serving as both reservoirs and vectors of R. rickettsii. Ticks transmit the bacteria primarily by their bites.
Powassan Virus (POWV) is the only tick-borne flavivirus endemic in North America. [2] POWV human illnesses have been reported in the United States, Canada and Russia. [2] POWV has different genetic variations including deer tick virus (DTV) which is transmitted by the black-legged tick (aka deer tick), Ixodes scapularis. [27]