“…Colonization of S. pneumoniae in nasopharynx was also analysed, discovering that 40-50% of 8-week-old infants were carriers of S. pneumoniae and as the infants grew, acquired pneumonia increased among them [7]. Also among S. pneumoniae serotypes isolated from nasopharynx of the carrier children, the six serotypes of 23f, 19f, 6b, 14, 6a, and 3 were more widespread [8]. The heptavalent S. pneumoniae protein conjugate vaccine (PCV7) has polysaccharide conjugates of serotypes 4, 6B, 9V, 14, 18C, 19F and 23F.…”