The Iridian Plague was a disease that existed in the galaxy prior to the First Order military's assault on the neutral Mid Rim world of Tah'Nuhna in 34 ABY. The doctors of the Tah'Nuhna species had been the ones to find a cure for the plague. As the First Order launched their attack, one member of the species reflected on that and other achievements of the Tah'Nuhna.
The Iridian Plague was first mentioned in the new Star Wars canon in the first issue of the comic series Star Wars: Allegiance, written by Ethan Sacks and published by Marvel Comics in 2019. The disease originated in the Star Wars Legends continuity, where it was first mentioned in the 2003 video game Star Wars: Knights of the Old Republic.
The Iridian Plague was first mentioned in the new Star Wars canon in the first issue of the comic series Star Wars: Allegiance, written by Ethan Sacks and published by Marvel Comics in 2019. The disease originated in the Star Wars Legends continuity, where it was first mentioned in the 2003 video game Star Wars: Knights of the Old Republic.