Molecular characterization of invasive Streptococcus pneumoniae clinical isolates from a tertiary children’s hospital in eastern China

作者：Xu Huang, Hua Tan, Feng Lü, Genglin Guo, Mingxiao Han, Tongbo Cai, Haifang Zhang · 发表于：Microbiology Spectrum · 年份：2023 · DOI：10.1128/spectrum.00913-23 · 被引用次数：6 · 研究领域：Pneumonia and Respiratory Infections、Streptococcal Infections and Treatments、Bacterial Infections and Vaccines

ABSTRACT Streptococcus pneumoniae is a common opportunistic pathogen that causes invasive pneumococcal disease (IPD), especially in children. This study aimed to determine the prevalence and molecular characteristics of S. pneumoniae isolated from children with IPD. A total of 78 S . pneumoniae isolates from aseptic body fluids of 70 IPD patients were collected at the Children’s Hospital of Nanjing Medical University (Jiangsu Province, China) during 2017–2021. Whole-genome sequencing technology was used to analyze the serotype, sequence type (ST), virulence, and antibiotic resistance of the 78 invasive S. pneumoniae clinical isolates. Our results showed that the pneumococcal infection rate declined after the COVID-19 outbreak in 2019. Serotypes 19F, 14, 6A, 23F, 19A, and 6B were the most common strains. The pneumococcal conjugate vaccine (PCV) 13 serotype coverage rate was 87.1%. All isolates were classified by multi-locus sequence typing (MLST) analysis into 27 different STs, including 3 novel STs (ST17941, ST17942, and ST17944) and 1 novel allele [recP (558)]. The most predominant ST was ST271, followed by ST320 and ST876. All isolates carried the following virulence genes: cbpG, lytB, lytC, pce (cbpE), pavA, slrA, plr (gapA), hysA, nanA, eno, piuA, psaA, cppA, iga, htrA (degP), tig (ropA), zmpB, and ply. All isolates were multidrug resistant and had high levels of resistance to macrolides, tetracyclines, and sulfonamides. Taken together, this study revealed extensive genet...