Toli-X

Toli-X was a deadly, mutated virus that lived in molds existing on the surface of certain asteroids. In this way, the virus could move from planet to planet. It infected a great number of worlds some twenty-five years before the Battle of Naboo, before the scientists and medical personnel of the Old Republic discovered a vaccine. Most who contracted the virus could be cured by the vaccine. It was later discovered that the planet Kegan had suffered an outbreak of the virus, but because of their isolationist government, had never learned of the vaccine.