That night, Jack tells everyone that he trusts Juliet and that should be enough, but Sayid disagrees. Jack continues to explain that John Locke blew up the submarine that was to take him home. Claire suddenly collapses with blood gushing from her face. Juliet takes Jack and Kate aside and tells them she knows what's wrong with Claire because she did it to her. At the camp, Juliet explains that Claire's immune system has turned against her due to a latent reaction to medication in her bloodstream. The medication was designed by Juliet to keep Claire alive during her pregnancy. She was brought to the island to find out why women couldn't have children. The mother's body treats the pregnancy as a foreign invader and the immune system attacks; every pregnant woman on the island has died. Claire was the first to survive even though she showed some of the symptoms.