Takan III

Takan III was the third planet in the Takan system. In the mid-24th century, humanoids on Takan III became infected with Takanian syndrome. 

History
In 2361, Takanian syndrome was diagnosed on Takan III for the first time. In 2409, 47.6 years later, Doctor Salaar mentioned Takan III when he explained the Takanian syndrome to a Starfleet officer on Xarantine VI, where the disease had broken out.