Phyrox plague
The Phyrox plague was a deadly disease that infected the population of Cor Caroli V in 2366. 

The plague was finally eradicated on stardate 43714.1 with the assistance of the crew of the . Following its eradication, Starfleet classified the Cor Caroli V plague as "secret."

Not long after this, the Enterprises captain, Jean-Luc Picard was kidnapped and held along with three other individuals of other species, one of which was actually one of the kidnappers posing as a Bolian Starfleet cadet named Mitena Haro. Picard was surprised that Haro showed knowledge of the Enterprises visit to Mintaka III, something that would normally not be known by a Starfleet cadet. He therefore tested her by mentioning Cor Caroli V and when she mentioned the Phyrox plague, secret knowledge she should not have been aware of, he pegged her as an impostor. ()

de:Phyrox-Seuche
ja:ファイロックス病
Medical conditions