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A) Number of ehrlichiosis cases caused by E. chaffeensis reported to CDC by State Health Department from 1999–2006. B) Average reported annual incidence of human monocytic ehrlichiosis by state –United States, 2001–2002 and nationwide. (Open access: published by the Centers for Disease Control and Prevention, a U.S. Government agency and are in the public domain and can be used without permission.)
