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Changes in pneumococcal nasopharyngeal colonization among children with respiratory tract infections before and after use of the two new extended-valency pneumococcal conjugated vaccines
- Changes in pneumococcal nasopharyngeal colonization among children with respiratory tract infections before and after use of the two new extended-valency pneumococcal conjugated vaccines
- Ahn, Jong Gyun; Choi, Seong Yeol; Kim, Dong Soo; Kim, Ki Hwan
- Ewha Authors
- SCOPUS Author ID
- Issue Date
- Journal Title
- INFECTIOUS DISEASES
- 2374-4235; 2374-4243
- vol. 47, no. 6, pp. 385 - 392
- Streptococcus pneumoniae; serotype; pneumococcal conjugate vaccine; nasopharyngeal colonization
- INFORMA HEALTHCARE
- SCI; SCIE; SCOPUS
- Background: The 10-valent pneumococcal non-typeable Haemophilus influenzae protein D conjugate vaccine (PHiD-CV) and the 13-valent pneumococcal conjugate vaccine (PCV13) replaced the 7-valent PCV (PCV7) in May 2010 in Korea. We investigated the dynamics of pneumococcal nasopharyngeal (NP) colonization in children with a respiratory illness before and after use of PHiD-CV and PCV13. Methods: From March 2009 to December 2012 NP secretions were obtained from 2176 children aged < 5 years with respiratory diseases. We used the multiplex polymerase chain reaction (PCR) technique to determine pneumococcal serotypes. Results: Among the samples, 468 (21.5%) specimens were positive by multiplex PCR. The overall pneumococcal colonization rate remained stable during the 2009-2012 periods. The serotypes present in PCV7 and serotype 19A decreased in frequency from 36.8% and 26.4% in 2009 to 10.1% and 11.4% in 2012, respectively (chi(2) for trend, P < 0.001 and P = 0.007, respectively). The frequency of non-PCV13 serotypes increased from 36.8% in 2009 to 78.5% in 2012 (chi(2) for trend, P = 0.001). There was no significant difference in carriage rates of each serotype between groups of children that received PCV7, PHiD-CV, or PCV13. Conclusions: Compared with the period of PCV7 vaccination, overall carriage rate was not affected by the introduction of new PCVs. However, serotype distribution now consists mostly of non-vaccine serotypes. PCVs affect mucosal immunity against Streptococcus pneumoniae (SP) in NP carriage; but, global SP colonization seems to be maintained by replacement.
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