Somahtur is perhaps the 30th Century galaxy's best-kept secret, mostly out of necessity. Discovered less than a century ago, the United Planets found a world populated by humanoid natives who act as host bodies for thriving colonies of bacterial and viral diseases, many of which are unknown beyond the confines of this bizarre planet.
The Somahturians have developed a symbiotic relationship with many of these diseases, and, unlike any other species in the galaxy, cannot live without them. The entire sector of space in which this world exists is under tight U.P. quarantine for all except authorized personnel from Medicus One. The doctors of Medicus One sometimes come to Somahtur to collect samples of various diseases and use the planet to warehouse specimens of diseases considered too dangerous to store anywhere else.
The Legion of Substitute Heroes' Infectious Lass is a native of Somahtur, having been taken off world by personnel of Medicus One in order to study the unique Somahturian physiology. She escaped their examination chambers; the authorities have been unable to return her to the world of her birth for fear that any overt action against her by them, will publicize the existence of Somahtur and cause a hypochondriacal panic across the galaxy.