Anaplasma

**Definition:** A genus of gram-negative bacteria whose organisms are obligate parasites of vertebrates. Species are transmitted by arthropod vectors with the host range limited to ruminants. Anaplasma marginale is the most pathogenic species and is the causative agent of severe bovine anaplasmosis.

**Tree numbers:** - B03.440.664.750.050 - B03.660.050.783.500.050