Dermacentor variabilis
variabilis" may also carry "Anaplasma phagocytophilum" , the causative agent of human granulocytic anaplasmosis , and "Ehrlichia chaffeensis" , the causative agent of human monocytic ehrlichiosis . 
<triplet> Anaplasma phagocytophilum <subj> human granulocytic anaplasmosis <obj> has effect