Safety and Efficacy of wSp Vaccine in Young Children

wSp vaccine will be administered as intramuscular (IM) injections of 0.5 mL (thus 1 mg total protein). wSp vaccine is supplied as single-dose glass vials in saline (0.9% sodium chloride) at 2 mg protein/mL, with aluminum hydroxide at 1.2 mg elemental Al/mL. Dose 1 will be given in the left thigh at 7 months of age, and dose 2 will be given in the right thigh at 9 months of age.

Saline will be administered as intramuscular (IM) injections of 0.5 mL. Dose 1 will be given in the left thigh at 7 months of age and dose 2 will be given in the right thigh at 9 months of age.