Skip to Content

human granulocytotropic ehrlichiosis


Definition: an acute infectious disease characterized by fever, chills, headache, joint and muscle pains, and sometimes respiratory, gastrointestinal, hepatic, or other systemic involvement; first described in 1994 in northeastern and northern midwestern states and in California. The causative agent, Anaplasma phagocytophilum, is an obligately intracellular organism with a gram-negative cell wall. The deer tick, Ixodes scapularis, is the principal vector, and the peak incidence is in July. Hematologic studies show depression of erythrocytes, leukocytes, and platelets. Clusters of developing organisms called morulae may be seen in neutrophils in stained blood smears, but serologic testing is more sensitive.

See: human ehrlichiosis, human monocytotropic ehrlichiosis

Disclaimer: This site is designed to offer information for general educational purposes only. The health information furnished on this site and the interactive responses are not intended to be professional advice and are not intended to replace personal consultation with a qualified physician, pharmacist, or other healthcare professional. You must always seek the advice of a professional for questions related to a disease, disease symptoms, and appropriate therapeutic treatments.
© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.