Kurtzen genetic disorder
The Kurtzen of the planet Bakura suffered from a genetic disorder as early as 150 BBY. That year, they encountered Human colonists chartered by the Bakur Mining Corporation. The Humans' technology helped eradicate the genetic disease. Nevertheless, Kurtzen population levels remained low for decades.
Sources
- The Truce at Bakura Sourcebook (First mentioned)
- The Essential Guide to Alien Species