TY - JOUR AU - Ubukata, Kimiko AU - Takata, Misako AU - Morozumi, Miyuki AU - Chiba, Naoko AU - Wajima, Takeaki AU - Hanada, Shigeo AU - Shouji, Michi AU - Sakuma, Megumi AU - Iwata, Satoshi T1 - Effects of Pneumococcal Conjugate Vaccine on Genotypic Penicillin Resistance and Serotype Changes, Japan, 2010–2017 T2 - Emerging Infectious Disease journal PY - 2018 VL - 24 IS - 11 SP - 2010 SN - 1080-6059 AB - To clarify year-to-year changes in capsular serotypes, resistance genotypes, and multilocus sequence types of Streptococcus pneumoniae, we compared isolates collected from patients with invasive pneumococcal disease before and after introductions of 7- and 13-valent pneumococcal conjugate vaccines (PCV7 and PVC13, respectively). From April 2010 through March 2017, we collected 2,856 isolates from children and adults throughout Japan. Proportions of PCV13 serotypes among children decreased from 89.0% in fiscal year 2010 to 12.1% in fiscal year 2016 and among adults from 74.1% to 36.2%. Although nonvaccine serotypes increased after introduction of PCV13, genotypic penicillin resistance decreased from 54.3% in 2010 to 11.2% in 2016 among children and from 32.4% to 15.5% among adults. However, genotypic penicillin resistance emerged in 9 nonvaccine serotypes, but not 15A and 35B. Multilocus sequence typing suggested that resistant strains among nonvaccine serotypes may have evolved from clonal complexes 156 and 81. A more broadly effective vaccine is needed. KW - invasive pneumococcal disease KW - serotype KW - antimicrobial resistance KW - Streptococcus pneumoniae KW - pneumococcal conjugate vaccine KW - multilocus sequence typing KW - bacteria KW - Japan DO - 10.3201/eid2411.180326 UR - https://wwwnc.cdc.gov/eid/article/24/11/18-0326_article ER - End of Reference