Carriage to Assess Protection of New Pneumococcal Vaccines - PCV15

VAXNEUVANCE (Merck, Sharp \& Dohme LLC, a subsidiary of Merck \& Co, Inc., Rahway, NJ, USA \[MSD\]) is a 15-valent PCV containing capsular polysaccharides from serotypes 1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, 23F, 22F, and 33F adjuvanted with aluminium phosphate.

Streptococcus pneumoniae SPN3 (Clade Ia, strain LIV014-S3) - Single inoculation at 80,000 colony-forming unit (CFU)/naris, 28 days after vaccination.

The placebo consists of 0.9% sodium chloride for injection