Patient description: The patient is a 23-year-old man who came to the hospital with high blood pressure (175/95 mmHg) and signs of septicemia. He developed respiratory failure requiring mechanical ventilation and renal failure requiring hemodialysis. His blood smear showed microangiopathic hemolytic anemia and thrombocytopenia. His blood tests revealed elevated lactate dehydrogenase and reduced human complement C3 levels with a normal coagulation profile. He was diagnosed with atypical hemolytic uremic syndrome. He was treated with plasma exchange and corticosteroids. He has been previously vaccinated with meningococcal group ACWY conjugate vaccine and meningococcal group B vaccine. The genetic survey revealed ADAMTS13 >10%.

Clinical trial eligibility criteria: eligible ages (years): 2.0-999.0,  Meningococcal Disease Individuals eligible for enrolment in this study are those: 1. who are of any gender, from the age of 2 and older, and to whom/whose parents or legally acceptable representatives the nature of the study has been described and the subject/subject's parent/legally acceptable representative has provided written informed consent. 2. who the investigator believes that the subject and/or his or her parent/legal representative can and will comply with the requirements of the protocol. 3. who are in good health as determined by clinical judgment of the investigator  Individuals not eligible to be enrolled in the study are those: 1. who are unwilling or unable to give written informed consent or assent to participate in the study. 2. who are perceived to be unreliable or unavailable for the duration of the study period. 3. who have previously been immunized with a meningococcal vaccine or vaccine containing meningococcal antigen(s) (licensed or investigational). 4. who have received any investigational or non-registered product (drug or vaccine) within 30 days prior to enrolment or who expect to receive an investigational drug or vaccine prior to the completion of the study. 5. who have received or who are planning to receive any vaccines (other than routine childhood vaccines) within 30 days before and after administration of study vaccine. (Exception: Influenza vaccine may be administered up to 15 days prior to study vaccination and at least 15 days after study vaccination) 6. who have behavioral or cognitive impairment or psychiatric disease that, in the opinion of the investigator, may interfere with the subject's ability to participate in the study. 7. who are pregnant or breast feeding (female subjects of appropriate age) or who plan to become pregnant during the course of the study. 8. who have any serious acute, chronic or progressive disease (e.g., any history of neoplasm, cancer, diabetes, cardiac disease, autoimmune disease, HIV infection or AIDS, or blood dyscrasias, with signs of cardiac or renal failure or severe malnutrition), who have epilepsy or any progressive neurological disease or history of Guillain-Barre syndrome. 9. who have a history of any anaphylaxis, serious vaccine reactions, or allergy to any vaccine components. 10. who are known to have a bleeding diathesis, or any condition that may be associated with a prolonged bleeding time. 11. who are included in study personnel or close family members of personnel conducting this study