Comparative Review of Brucellosis in Small Domestic Ruminants.

and are the primary etiological agents of brucellosis in small domestic ruminants. was first isolated in 1887 by David Bruce in Malta Island from spleens of four soldiers, while was originally isolated in Australia and New Zealand in early 1950's from ovine abortion and rams epididymitis. Today, both agents are distributed worldwide: remains endemic and associated with an extensive negative impact on the productivity of flocks in -some regions, and is still present in most sheep-raising regions in the world.