[1] Devine VT, Cleary DW, Jefferies JM, et al. The rise and fall of pneumococcal serotypes carried in the pcv era. Vaccine, 2017; 35, 1293-8. doi:  10.1016/j.vaccine.2017.01.035
[2] Rose M, Zielen S. Impact of infant immunization programs with pneumococcal conjugate vaccine in europe. Expert Rev Vaccines, 2009; 8, 1351-64. doi:  10.1586/erv.09.78
[3] Pilishvili T, Lexau C, Farley MM, et al. Sustained reductions in invasive pneumococcal disease in the era of conjugate vaccine. J Infect Dis, 2010; 201, 32-41. doi:  10.1086/648599
[4] Adegbola RA, Deantonio R, Hill PC, et al. Carriage of streptococcus pneumoniae and other respiratory bacterial pathogens in low and lower-middle income countries:A systematic review and meta-analysis. Plos One, 2014; 9, e103293. doi:  10.1371/journal.pone.0103293
[5] Azzari C, Moriondo M, Indolfi G, et al. Realtime pcr is more sensitive than multiplex pcr for diagnosis and serotyping in children with culture negative pneumococcal invasive disease. Plos One, 2010; 5, e9282. doi:  10.1371/journal.pone.0009282
[6] English AI. Pneumococcal vaccines who position paper——2012. Wkly Epidemiol Rec, 2012; 87, 129-44. https://www.ncbi.nlm.nih.gov/pubmed/24340399
[7] Johargy AK, Momenah AM, Ashgar SS, et al. Potential risk of streptococcus pneumoniae in nasopharyngeal carriage during umrah and hajj seasons in makkah, saudi arabia. Journal of Microbial & Biochemical Technology, 2017; 8, 14-20. https://www.omicsonline.org/proceedings/potential-risk-of-streptococcus-pneumoniae-in-nasopharyngeal-carriage-during-umrah-and-hajj-seasons-in-makkah-saudi-arab-56421.html
[8] Bogaert D, De GR, Hermans PW. Streptococcus pneumoniae colonisation:The key to pneumococcal disease. Lancet Infect Dis, 2004; 4, 144-54. doi:  10.1016/S1473-3099(04)00938-7
[9] Gillis HD, Als L, ElSherif M, et al. Assessing the diagnostic accuracy of pcr-based detection of streptococcus pneumoniae from nasopharyngeal swabs collected for viral studies in canadian adults hospitalised with community-acquired pneumonia:A serious outcomes surveillance (sos) network of the Canadian Immunization Research (CIRN) study. BMJ, 2017; 7, e015008. http://jcm.asm.org/content/52/1/83.short?cited-by=yes&legid=jcm;52/1/83