Medical Definition of tick–borne fever
: a usually mild rickettsial disease of ruminant animals (as sheep and cattle) especially in Europe that is caused by a bacterium of the genus Anaplasma (A. phagocytophilum synonym Ehrlichia phagocytophilia) which is transmitted by a tick of the genus Ixodes, and that is marked by fever, listlessness, and anorexia
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