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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 most well-known hard ticks. Diseases are spread when it sucks blood from the host, which could take several days for the host to experience some symptoms. Though ''D. variabilis'' may be exposed to ''Borrelia burgdorferi'', the causative agent of Lyme disease, these ticks are not competent vectors for the transmission of this disease. The primary vector for ''Borrelia burgdorferi'' is the deer tick ''Ixodes scapularis'' in Eastern parts of the United States, and ''Ixodes pacificus'' in California and Oregon. ''Dermacentor variabilis'' may also carry ''Anaplasma phagocytophilum'', the causative agent of HGE (human granulocytic ehrlichiosis), and ''Ehrlichia chaffeensis'', the causative agent of HME (human monocytic ehrlichiosis).〔 ''Dermacentor'' ticks may also induce tick paralysis by elaboration of a neurotoxin that induces rapidly progressive flaccid quadriparesis similar to Guillain-Barré syndrome. The neurotoxin prevents presynaptic release of acetylcholine from neuromuscular junctions. ==See also== * ''Rhipicephalus sanguineus'' (Latreille, 1806) – brown dog tick * Ticks of domestic animals 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dermacentor variabilis」の詳細全文を読む スポンサード リンク
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