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      Molecular typing and virulence gene detection of Streptococcus pneumoniae in Zhaoqing, Guangdong

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          Abstract

          Objective To understand the common serotypes and five virulence genes of Streptococcus pneumoniae, we provide a useful basis for clinical diagnosis and application of new vaccines.

          Methods Select the 200 strains of Streptococcus pneumoniae which isolated from the First People’s Hospital of Zhaoqing from April 2016 to December 2018 for the research objects,serotyping was performed by multiplex polymerase chain reaction (PCR), then serotype 6A/6B was subdivided by single factor serum. Five virulence genes (ply, pspA, nanA, psaA, lytA) of Streptococcus pneumoniae were detected by PCR, used SPSS 19.0 to statistical analysis.

          Results The male patients (144 cases) more than female patients (56 cases) of the 200 strains of Streptococcus pneumonia. Most of the patients were 0–2 years old, accounting for 67.5%. Over 50 years old (16.5%) patients were the second. The main type of specimens was sputum, accouting for 92.0%. The typing rate of the multiple PCR method was 95.0%, mainly serotypes were 19F (37.5%), 6B (12.0%), 23F (10.0%), 19A (9.0%), 3 (6.5%), 14 (6%) and 15B/15C (5.5%). The positive rates of five virulence genes were ply 93.5%, pspA 85.0%, nanA 88.5%, psaA 90.5% and lytA 93.0%. Eight strains of blood culture, one strain of cerebrospinal fluid culture and three serotypes of 19A, 3 and 35A/35C/42, the positive rate of five virulence genes was 100.0%. The positive rate of five genes of serotypes 14 and 5 were lower.

          Conclusion The mainly serotypes of 200 strains of Streptococcus pneumoniae in this area were 19F, 6B, 23F, 19A, 3, 14, 15B/15C,children under two years old and elderly with high infection rate.Most strains have five virulence genes with high conservativeness.The existence of five virulence genes is slightly different with different serotypes, which can provide a favorable basis for the development of new vaccines and disease prevention.

          Abstract

          摘要: 目的 了解肺炎链球菌常见血清型及其 5 种毒力基因的携带情况, 为新型疫苗开发研究和提高临床诊断提 供基础科学依据。 方法 选取 2016 年 4 月一 2018 年 12 月肇庆市第一人民医院住院及门诊患者分离 200 株肺炎链球 菌, 采用多重 PCR 分子分型方法进行血清型分型, 再用单因子血清对 6A/6B 型进行细分。利用 PCR 方法对肺炎链球菌 5 种毒力基因 ( plypspAnanApsaAlytA) 进行检测, 使用 SPSS 19.0 进行统计学分析。 结果 200 株肺炎链球菌来自男性 患者 144 例, 女性患者 56 例。0~2 岁的患者最多 (占67.5%), 其次是 ≥50 岁患者为 16.5%。标本类型以痰为主, 占 92.0%。多重 PCR 法分型率为 95.0%, 血清型以 19F (37.5%)、6B(12.0%)、23F(10.0%)、19A(9.0%)、3(6.5%)、14(6%)、15B/ 15C(5.5%) 为主。5 种毒力基因检测阳性率分别为 ply 93.5%、 pspA 85.0%、 nanA 88.5%、 psaA 90.5%、 lytA 93.0%。8 株血培 养、1 株脑脊液培养及 19A、3 和 35A/35C/42 三种血清型的 5 种毒力基因阳性率均为 100.0%。血清型 14 型和 5 型的 5 种 毒力基因阳性率都较低。 结论 肇庆市 200 株肺炎链球菌的血清型以 19F、6B、23F、19A、3、14、15B/15C 为主, 2 岁以下 的儿童和老年人感染率高。5 种毒力基因保守性高, 大部分菌株均存在。血清型不同, 5种毒力基因的存在也略有不 同, 可为新型疫苗开发及疾病预防提供有利的依据。

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          Author and article information

          Journal
          CTM
          China Tropical Medicine
          China Tropical Medicine (China )
          1009-9727
          1 March 2020
          1 April 2020
          : 20
          : 3
          : 231-235
          Affiliations
          1Clinical Laboratory, The first People’s Hospital of Zhaoqing, Zhaoqing, Guangdong 526060, China
          Author notes
          Corresponding author: LIANG Lixia, E-mail: miki128@ 123456126.com
          Article
          j.cnki.46-1064/r.2020.03.08
          10.13604/j.cnki.46-1064/r.2020.03.08
          © 2020 Editorial Department of China Tropical Medicine

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 Unported License (CC BY-NC 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by-nc/4.0/.

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