The aim of the study is to further characterize the safety and immunogenicity of Menactra® in the population \<2 years of age when administered alone and when the second dose is administered concomitantly with the 4th dose of Pentacel®, a licensed pediatric vaccine. Primary Objectives: * To evaluate and compare the antibody responses to meningococcal serogroups A, C, Y, and W-135 induced by 2 injections of Menactra® in subjects aged 9 months at the first vaccination visit and 15 to 18 months at the second vaccination visit. * To evaluate and compare the antibody responses to Pertussis (pertussis toxoid \[PT\], filamentous haemagglutinin \[FHA\] and pertactin \[PRN\]) antigens induced by a dose of Pentacel® when administered concomitantly with Menactra® to those elicited by a dose of Pentacel® administered alone. * To evaluate and compare the antibody responses to polyribosylribitol phosphate (PRP), tetanus and diphtheria antigens induced by a dose of Pentacel® when administered concomitantly with Menactra® to those elicited by a dose of Pentacel® alone. Observational Objectives: * To describe the safety profile (immediate unsolicited AEs within 30 minutes of each trial vaccination, solicited reactions within 7 days of each vaccination, unsolicited AEs within 30 days of each vaccination, and serious adverse events \[SAEs\] throughout the course of the trial from Day 0 up to Day 30 after the last trial vaccination\[s\]) in all trial groups * To describe the antibody responses to meningococcal serogroups A, C, Y, and W-135, measured by SBA HC, 30 days after the second Menactra® administration * To describe the antibody responses to Pentacel® (PT, FHA, PRN, FIM, diphtheria, tetanus, polio, PRP) measured by enzyme-linked immunosorbent assay (ELISA), radioimmunoassay (RIA), or functional assays.
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Percentage of Study Participants Achieving Menactra Response for Meningococcal Serogroups A, C, Y, and W-135 Following the Second Menactra Vaccination
Timeframe: Day 30 post second Menactra vaccination
Geometric Mean Concentrations of Pertussis Vaccine Antibodies Following Vaccination With Either Pentacel Only or Menactra Concomitantly With Pentacel Vaccine
Timeframe: Day 30 post-vaccination 2
Percentage of Participants With Pertussis Vaccine Responses Following Vaccination With Either Pentacel Only or Menactra Concomitantly With Pentacel Vaccine
Timeframe: Day 30 post-vaccination 2
Percentage of Participants With Antibody Responses to Diphtheria, Tetanus and Polyribosylribitol Phosphate Antigens Following Vaccination With Either Pentacel Only or Menactra Concomitantly With Pentacel Vaccine
Timeframe: Day 30 post-vaccination 2