The virus raged on for some time in the mutant population, until Mystique, in an effort to make the world safe for mutants, modified the virus to affect only humans. When Moira found out about this strain of the virus, she finally grasped what the key to the cure was. Unfortunately, she was mortally wounded by Mystique during the Brotherhood of Mutants' attack on Muir Island and did not live to complete the cure. Professor X did manage to telepathically retrieve the critical information before Moira died.