A Study of 2 Doses of Menactra®, a Meningococcal Conjugate Vaccine in Healthy Toddlers

Inclusion Criteria: * Healthy, as determined by medical history and physical examination. * Aged 9 months (249 to 291 days) at the time of enrollment. * The parent or legal guardian has signed and dated the Institutional Review Board-approved informed consent form Exclusion Criteria: * Serious acute or chronic disease (e.g., cardiac, renal, metabolic, rheumatologic, psychiatric, hematologic, or autoimmune disorders, diabetes, atopic conditions, congenital defects, convulsions, encephalopathy, blood dyscrasias, leukemia, lymphomas of any type, or other malignant neoplasms affecting the bone marrow or lymphatic system, acute untreated tuberculosis) that could interfere with trial conduct or completion. * Known or suspected impairment of immunologic function. * Acute medical illness within the last 72 hours, or temperature ≥ 100.4 ºF (≥ 38.0 ºC) at the time of enrollment. * History of documented invasive meningococcal disease or previous meningococcal vaccination. * Known human immunodeficiency virus (HIV), hepatitis B, or hepatitis C seropositivity as reported by the parent or legal guardian * Received either immune globulin or other blood products within the last 3 months, or received injected or oral corticosteroids, or other immunomodulator therapy within 6 weeks of the study vaccines. Individuals on a tapering dose schedule of oral steroids lasting \< 7 days and individuals (e.g., asthmatics) on a short schedule of oral steroids lasting 3 to 4 days may be included in the…