Odana was the daughter of Prime Minister Hodin of the planet Gideon. In 2269, Hodin had Odana meet with Starfleet Captain James T. Kirk on a mock-up of his starship, the USS Enterprise. Once contact was established, she would then contract Vegan choriomeningitis using Kirk's blood, a disease which Kirk had been cured of, but which still remained in his bloodstream. Odana's father then planned for the fatal disease to be spread amongst the inhabitants of Gideon in an attempt to reduce the population, as the Gideon people were immune to all diseases on their planet.
Doctor Leonard McCoy was able to cure Odana, but she was still able to infect her people, proving Hodin's plan to be successful