Grennai

The Grennai were a humanoid race native to the planet NGC 667. They were distinguished by dark olive-green skin and white hair.

As of the mid 23rd century, they were a pre-industrial culture, and had come to the attention of Starfleet scientists. In 2265, a mutated strain of Ametan rubeola spread from the human observers to the Grennai population, eradicating an entire village. However, the culture's low technological level prevented it from becoming a global pandemic. (TOS short story: "First, Do No Harm")