Vaccine "Metroid"

The Metroid vaccine was a vaccine that saved Samus from death in Metroid Fusion. Once the X Parasite had infested Samus's central nervous system, she lost consciousness, causing her gunship to drifted into an asteroid belt. Her ship's emergency systems automatically ejected the escape pod before impact, which Biologic Space Laboratories later retreived and transported Samus to Galactic Federation HQ. During the journey, the X multiplied within her, corrupting large areas of her Power Suit. It was learned that the organic components of her Power Suit had become so integrated with her central nervous system that it could not be removed while she was unconscious. Large portions of her suit had to be surgically removed, greatly altering her physical appearance. Unfortunately, the X in her central nervous system were too embedded to be removed safely, causing her to be given a minimal chance of survival. However, a cure was soon proposed. Doctors proposed using a Metroid cell to make an anti-X vaccine. This cell came from the infant Metroid that Samus found on SR388 and gave to Ceres Space Colony. The vaccine was injected and the X were immediately destroyed, causing the infant Metroid to save Samus's life a second time.