Rocky mountain spotted fever is tick-borne infection. In endemic areas, the prevalence of the diseases is 15 per 100,000 persons. The disease is characterized by sudden onset of fever and headache. It is caused by gram-negative intracellular bacteria Rickettsia rickettsii. The bacteria have a high predisposition for the endothelial cell. Actin protein polymerization in the cells is important for the spread of bacteria from one cell to another. (Raoult & Parola, 2007) The bacteria cause lymphohistiocytic vasculitis and necrosis of the infected cells. It typically takes 5-7 days from the day of tick bite to the onset of symptoms. ...
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Grizzly bear is a subspecies of a brown bear, which can be found in Alaska and Western Canada. Isolated populations of grizzly bears can also be found in northern Idaho, western Montana, in north-western Wyoming and North Cascade Mountains (Washington State). In all ecosystems in which grizzly bears live, they play an important role and significantly affect their functioning. Due to being omnivorous, these bears are included in the food chain at various levels. Despite the fact that the diet of this species is dominated by vegetable food, grizzly bears are the largest land predators in the territories where ...
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