Human granulocytic ehrlichiosis

Human granulocytic anaplasmosis (HGA) (previously called Human granulocytic ehrlichiosis, or HGE ) is an infectious disease caused by several types of bacteria that are typically transmitted to humans by Ixodes scapularis, also known as the deer tick or black-legged tick. This is the same tick that can transmit Lyme disease and Babesiosis. Fortunately, early treatment with antibiotics is often successful.

Symptoms
Symptoms may include fever, severe headache, muscle aches, chills and shaking, similar to the symptoms of influenza.

Terminology
HGA can be caused by several infectious agents, including Anaplasma phagocytophilum (formerly known as Ehrlichia phagocytophila), Ehrlichia equi, and Ehrlichia ewingii. HGA is clinically indistinguishable from infection caused by Ehrlichia chaffeensis, but molecular techniques can distinguish these incidents from HGA.