Orkett's disease

From Memory Alpha, the free Star Trek reference

Orkett's disease was caused by a virus that affected thousands of Bajoran children during the Cardassian Occupation of Bajor. The disease was usually terminal unless a suitable bone marrow transplant was performed. (VOY: "State of Flux")

In 2371, USS Voyager's EMH discovered that Seska's blood chemistry was not consistent with that of a Bajoran. Her cover story was that she suffered from Orkett's disease as a child during the Occupation of Bajor, and that she had received a bone marrow transplant from a Cardassian woman named Kattell. (VOY: "State of Flux")