Dermacentor occidentalis
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Dermacentor occidentalis (click on image to enlarge it)
Author(s): Jerry Kirkhart
Source: Wikimedia Commons
Author(s): Jerry Kirkhart
Source: Wikimedia Commons

Dermacentor occidentalis (click on image to enlarge it)
Author(s): Mat Pound, USDA Agricultural Research Service
Source: IPM Images
Author(s): Mat Pound, USDA Agricultural Research Service
Source: IPM Images
Dermacentor occidentalis Marx, 1892 - (Pacific Coast tick)
This tick is common in the coastal region of south-western U.S., with only Ixodes pacificus being more common in California. It often carries human pathogens, like various Rickettsia species, Anaplasma phagocytophilum, Borrelia burgdorferi, Ehrlichia chafeensis, Francisella tularensis or the Colorado tick fever virus. Among the Rickettsia species, infections by Rickettsia rhipicephali (Paddock et al., 2018) and Rickettsia philipii (Bouquet et al., 2017) are common.