From
Wikipedia:
The vaccine is, however, primarily developed for the U.S. and European epidemiological situation, and therefore it has only a limited coverage of serotypes causing serious pneumococcal infections in most developing countries.[15]
Barocchi MA, Censini S, Rappuoli R (2007). "Vaccines in the era of genomics: the pneumococcal challenge"
Due to the geographic distribution of pneumococcal serotypes, additional research is needed to find the most efficacious vaccine for developing-world populations. In a previous study, the most common pneumococcal serotypes or groups from developed countries were found to be, in descending order, 14, 6, 19, 18, 9, 23, 7, 4, 1 and 15. In developing countries the order was 6, 14, 8, 5, 1, 19, 9, 23, 18, 15 and 7.[13]
Sniadack DH, Schwartz B, Lipman H, Bogaerts J, Butler JC, Dagan R, Echaniz-Aviles G, Lloyd-Evans N, Fenoll A (June 1995). "Potential interventions for the prevention of childhood pneumonia: geographic and temporal differences in serotype and serogroup distribution of sterile site pneumococcal isolates from children--implications for vaccine strategies". Pediatr
My Webpage Infect Dis J 14 (6): 503–10. doi:10.1097/00006454-199506000-00007. PMID 7667055