Intracellular tick-borne gram - bacteria; HME (Ehrlichia chaffeensis 入 monocyte) + HGA (Anaplasma phagocytophilum 入 PMN); thrombocytopenia + leukopenia + ↑ LFT 三聯; doxycycline 同 Rickettsia; 同 Ixodes tick as Lyme — co-infection common。