Primary Outcomes
Measure: Occurrence of solicited local and systemic adverse events (AE)within 8 days after vaccination (Days 0-7 and Days 28-35)
Time: 8 days after vaccination (Days 0-7 and Days 28-35)
Measure: Incidence of vaccine-related serious adverse events (SAEs) throughout the duration of the study.
Time: Day 0 to Day 758
Measure: Occurrence of laboratory abnormalities at 8 days after vaccination (Days 8 and 36)
Time: 8 days after vaccination (Days 8 and 36)
Secondary Outcomes
Measure: Immunogenicity: Proportion of subjects achieving a detectable serum neutralizing antibody titer against SARS-CoV in each immunized group 28 days after receipt of the second dose of vaccine (approximately Day 56)
Time: 28 days after receipt of the second dose of vaccine (approximately Day 56)
Measure: Immunogenicity: GMT of neutralizing antibody titers against SARS-CoV in each immunized group 28 days after receipt of the second dose of vaccine (Day 56). Measurement will include the Day 56 GMT and the mean fold change (GMT ratio Day 56:Day 0)
Time: 28 days after receipt of the second dose of vaccine (Day 56)
Measure: Comparison of rates of unsolicited AEs related to vaccine for all subjects between treatment groups and in the combined cohorts receiving vaccine with aluminum hydroxide adjuvant compared with those receiving vaccine with no adjuvant.
Time: intervals from Days 0-7, Days 0-28, Days 8-28, Days 0-56, Days 29-36, and Days 29-56.
Measure: Immunogenicity: Geometric Mean Titer (GMT) of antibody titers (IgG ELISA for S protein of SARS-CoV) 28 days after receipt of the second dose of vaccine (Day 56) at each vaccine dose level, with and without adjuvant
Time: 28 days after receipt of the second dose of vaccine (Day 56)