The Fostossa virus was an epidemic on Bajor while Crell Moset, a Cardassian exobiologist, was practicing medicine during the Cardassian Occupation of Bajor.

The incident was recalled by Ensign Tabor of USS Voyager. Crell used inhumane practices, which he described as "procedures that never would have occurred to me under normal circumstances." According to Tabor, Moset infected hundreds of unaffected Bajorans, including Tabor's grandfather and brother, with the virus to produce a cure. Thousands of people died in his hospital, Tabor's relatives among them. On investigation into his activities during the Occupation, the Voyager crew found that he did not request any of the normal enzymes used in eliminating viruses. A more damning piece of evidence came when it was discovered that there had not been a single outbreak of Fostossa in the province in which he was practicing until his experiments began.

Moset's research did provide a cure, however, and Fostossa was eradicated sometime during the occupation. (VOY: "Nothing Human")

According to the Star Trek: Terok Nor novel Night of the Wolves, Kira Nerys' mother Kira Meru died of the Fostossa virus in a Cardassian hospital in 2353, having been infected with it by Moset on the orders of Gul Dukat. This would suggest that Moset discovered the cure at some point after the elder Kira's death.
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