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Yoon, Jin Gu; Jang, A-Yeung; Kim, Min Ja; Seo, Yu Bin; Lee, Jacob; Choi, Young Hwa; Kim, Young Keun; Jeong, Eun Joo; Kim, Hyun Soo; Kwon, Ki Tae; Jung, Dong Sik; Choi, Won Suk; Lee, Jin Soo; Park, Kyung Hwa; Jeong, Hye Won; Baik, Seung hee; Kang, Seong Hui; Bae, In-Gyu; Noh, Ji Yun; Cheong, Hee Jin; Kim, Woo Joo; Song, Joon Young
Vaccine, 04/2022, Volume: 40, Issue: 15Journal Article
•Serotype 3 and 19A were still most prevalent in adults in the era vaccines.•Ceftriaxone non-susceptible rate was high (32.5%) in invasive pneumococci.•Serotypes 11A/E and 19A pneumococci showed low ceftriaxone susceptibility.•Ceftriaxone non-susceptibility was related to sequence type 166 and 320. Invasive pneumococcal disease (IPD) is associated with substantial morbidity and mortality in children and elderly populations. Serotype distribution and antibiotic susceptibility of IPD isolates are changing with the implementation of pneumococcal vaccination and increasing antibiotic use worldwide. We aimed to determine serotype distribution, antibiogram, and molecular epidemiology of pneumococci in the late stage of PCV13 era. Prospective multicenter IPD surveillance study was conducted for adults aged ≥ 19 years from July 2019 to June 2021. Clinical and epidemiologic data were collected. In addition, antibiotic susceptibility test, serotype identification and multi-locus sequence typing (MLST) was taken for pneumococcal isolates. A total of 160 IPD cases were collected with mean age of 65.1 years (male, 72.5%). Serotyping was taken for 116 available pneumococcal isolates. PCV13 and PPSV23 serotypes were 32.8% (n = 38) and 56.0% (n = 65), respectively. Serotype 3 (13.8%) and 19A (9.5%) were the most common causative agents of IPD, followed by serogroup 11 (6.9%), 23A (6.9%), 10A (4.3%), and 15B (4.3%). Notably, 32.5% of invasive pneumococcal isolates were non-susceptible to ceftriaxone. Serotypes 11A, 11E and 19A pneumococci showed high ceftriaxone non-susceptible rate (80%, 100% and 81.8% respectively), and they were related to sequence type (ST) 166 and ST320. In comparison, most serotype 3 isolates were ceftriaxone susceptible and related to ST180. PCV serotypes, especially 3 and 19A, are still prevalent in adult IPDs, suggesting that individual PCV13 immunization would be necessary for the elderly people and chronically ill patients. Ceftriaxone non-susceptible rate was remarkably high in invasive pneumococcal isolates.
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