Human granulocytic anaplasmosis
Human granulocytic anaplasmosis (HGA) is a tick-borne infection caused by the bacterium Anaplasma phagocytophilum, a small bacterium infecting typically neutrophils transmitted by Ixodes ticks. Granulocytic anaplasmosis is the most widespread tick-borne infection in animals in Europe.
Our tick maps show the geographical distribution of tick species in Europe.
Infographic: tick-borne diseases
Find out more about tick species in Europe, what diseases they transmit, tick lifecycles, and patterns of transmission.