Article: Anaplasmosis and Ehrlichiosis - Maine, 2008

Anaplasmosis and ehrlichiosis are rickettsial tickborne diseases that have had at least a twofold increase in prevalence in the United States since 2000 (1,2). Despite similar clinical presentations, the causative organisms are carried by different ticks with distinct geographic and ecologic associations (3). Surveillance efforts are complicated by ambiguous terminology and serologic testing with antibody cross-reactivity. Although anaplasmosis historically has been reported in Maine, ehrlichiosis has been reported infrequently. During 2007-2008, the number of physician-reported anaplasmosis cases nearly doubled in Maine, and ehrlichiosis cases increased more than fourfold. To examine this ...

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