The Oby VI plasma plague virus
Oby VI was the inhabited sixth planet of the Oby system.
On stardate 38235.3 in the year 2294, an outbreak of the plasma plague on isolated sections of the northern continent was reported on Oby VI.
Initial investigations were undertaken by Doctor Susan Nuress and her research associates, consisting of Doctors Rob Bowman, Maurice Hurley, Jaron Summers and Jon Povill. It was discovered that initial treatment regimes of indicated medication proved increasingly ineffective, with mortality reaching 99+%.
The particular viral strain found on Oby VI was initially believed to be closely related to either the Legato or Hutzel infection, but all cases proved highly resistant to normal treatment protocol. During Oby VI's next planetary year, more than 2,000 cases of infections with the virus were reported, with growth proceeding exponentially. To counteract the infection, Dr. Nuress developed a unique strain of the virus (number nine in a series of tests), by bombarding it with Eichner radiation.
A sample of this virus was transported seventy years later aboard the USS Enterprise-D. (TNG: "The Child", okudagram)