Loedorvian Brain Plague
this extremely deadly plague was used as a bio-weapon by the forces of the Confederacy of Independent Systems, during the height of the Clone Wars. The plague attacked the brain and central nervous system of humans, killing them in a very short time. General Grievous used the Loedorvian Brain Plague to eliminate all the clone troopers of the Grand Army of the Republic in the Weemell Sector, and nearly killed the sector's entire human population in the attack. As a result, Weemell Sector was rendered uninhabitable in a matter of months.