Genetic structures of invasive Streptococcus pneumoniae isolates from Korean children obtained between 1995 and 2013

Ki Wook Yun, Eun Hwa Choi, Hoan Jong Lee, Jin Han Kang, Kyung Hyo Kim, Dong Soo Kim, Yae Jean Kim, Byung Wook Eun, Sung Hee Oh, Hye Kyung Cho, Young Jin Hong, Kwang Nam Kim, Nam Hee Kim, Yun Kyung Kim, Hyunju Lee, Taekjin Lee, Hwang Min Kim, Eun Young Cho, Chun Soo Kim, Su Eun ParkChi Eun Oh, Dae Sun Jo, Young Youn Choi, Jina Lee

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)


    Background: Understanding the population genetics of pneumococci will allow detection of changes in the prevalence of circulating genotypes and evidence for capsular switching. We aimed to analyze the genetic structure of invasive pneumococcal isolates obtained from children before and after the use of pneumococcal conjugate vaccines (PCVs) in Korea. Methods: A total of 285 invasive pneumococcal isolates were analyzed using serotyping, multilocus sequence typing, and antimicrobial susceptibility testing. We classified the isolation year to pre-PCV7 (1995-2003; n = 70), post-PCV7 (2004-2010; n = 142), and post-PCV13 (2011-2013; n = 73) periods. Results: Of the 10 clonal complexes (CCs), antibiotic-resistant international clones, CC320 (31.6%), CC81 (14.7%), and CC166 (6.7%) were the main complexes. Serotype 19A was the main serotype of CC320 throughout the periods. Serotypes of CC81 mainly comprised of 23F (53.3%) in pre-PCV7 period and replaced by non-vaccine types (NVTs; 6C [10%], 13 [30%], 15A [40%], and 15B/C [20%]) in post-PCV13 period. The main serotype responsible for CC166 also changed from 9 V (80%) in pre-PCV7 to NVT 11A (50%) in post-PCV13 periods. Non-susceptibility to penicillin (42.3%) was the highest in CC320, increasing from 0 to 76%. Conclusion: The genetic structures of invasive pneumococcal isolates in Korean children have changed concomitantly with serotype after the implementation of PCVs.

    Original languageEnglish
    Article number268
    JournalBMC infectious diseases
    Issue number1
    Publication statusPublished - 2018 Jun 8

    Bibliographical note

    Funding Information:
    This research was supported by the Ministry of health and Welfare, Republic of Korea (HI-12C0756). The funding body did not intervene in any step of the design of the study and collection, analysis, and interpretation of data and in writing the manuscript.

    Publisher Copyright:
    © 2018 The Author(s).


    • Children
    • Invasive pneumococcal diseases
    • Multilocus sequence typing
    • Pneumococcal conjugate vaccine

    ASJC Scopus subject areas

    • Infectious Diseases


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