These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: [Molecular characteristics and drug susceptibility analysis of Streptococcus agalactiae from respiratory specimen sources].
    Author: Han X, Gong XY, Miao BB, Xing H, Liu ZL, Gao PF, Li YL, Li JC, Tang YT, Ge YL, Dong AY, Li J.
    Journal: Zhonghua Yu Fang Yi Xue Za Zhi; 2024 Jun 06; 58(6):891-897. PubMed ID: 38955738.
    Abstract:
    To study the carriage status of drug susceptibility, clonal complex groups, serotypes, surface proteins and virulence genes of Streptococcus agalactiae from respiratory specimen sources. A total of 35 strains of S.agalactiae meeting the criteria were collected from 3 hospitals in 2 locations, Tangshan and Jinan. The age span of the patients was 3 days-92 years, and the percentage of elderly patients≥60 years was 71.5%.The susceptibility to 9 antimicrobial drugs was measured and analyzed using the micro broth dilution method. The strains were 100.0% sensitive to penicillin, linezolid, vancomycin, and ceftriaxone; However, it exhibits high resistance rates to erythromycin, clindamycin and levofloxacin, at 97.1%, 85.7% and 82.9% respectively; and the resistance rates to tetracycline and chloramphenicol were 34.3% and 14.2%, respectively. Genome sequence determination and analysis showed that 16 resistance genes were detected in 35 strains, among which: macrolide and lincosamide resistance genes were mainly ermB, with a carrying rate of 74.2%; tetracycline resistance genes were mainly tetM, with a carrying rate of 25.7%; in addition, the mutation rates of the quinolone resistance determinants gyrA and parC were 88.5% and 85.7%, respectively. 35 strains belonged to 6 ST types and 4 clonal groups, with CC10/ST10 as the main one, accounting for 62.8%; they contained 4 serotypes of Ⅰb, Ⅱ, Ⅲ, and Ⅴ, as well as 1 untyped strain, with serotype Ⅰb as the main one, accounting for 65.7%. The strains carried three pilus types, PI1+PI2a, PI2a and PI2b types, respectively, and detected five surface proteins, alpha, alp1, rib, srr, and rdf_0594, and seven virulence factors, cba, cfb, cylE, fbsA, hylB, lmb, and pavA. Overall, S.agalactiae isolated from respiratory tract specimens is predominantly sourced from elderly patients, with CC10 strains being most prevalent. These strains harbor multiple drug-resistant and virulence genes, demonstrating elevated resistance rates to macrolides, lincosamides, and quinolones. This emphasizes the necessity for vigilant attention to the health threat posed by S. agalactiae from respiratory tract speciments of elderly patients. 研究呼吸道标本来源无乳链球菌的药物敏感性、克隆群、血清型和表面蛋白、毒力基因的携带状况，分析其流行分布、耐药和毒力特征。从唐山、济南2地3家医院共收集到符合标准的无乳链球菌35株。患者的年龄跨度为3 d~92岁，≥60岁的老年患者占比为71.5%。采用微量肉汤稀释法测定其对9种抗菌药物的敏感性，菌株对青霉素、利奈唑胺、万古霉素和头孢曲松100.0%敏感；对红霉素、克林霉素和左氧氟沙星的耐药率高，分别为97.1%、85.7%和82.9%；四环素和氯霉素的耐药率分别为34.3%和14.2%。基因组序列测定及分析显示：35株菌株中检出16种耐药基因，其中：大环内酯类和林可酰胺类药物耐药基因以ermB为主，携带率为74.2%；四环素类耐药基因以tetM为主，携带率为25.7%；此外，喹诺酮类药物耐药决定簇gyrA和parC的突变率分别为88.5%和85.7%。35株菌株分属于6种ST型和4个克隆群，以CC10/ST10为主，占比为62.8%；包含Ⅰb、Ⅱ、Ⅲ和Ⅴ型4种血清型以及1株未分型，以血清型Ⅰb为主，占65.7%。菌株分别携带PI1+PI2a、PI2a和PI2b型3种类型的菌毛，检测到alpha、alp1、rib、srr和rdf_0594 5种表面蛋白和cba、cfb、cylE、fbsA、hylB、lmb和pavA 7种毒力因子。综上，呼吸道标本来源的无乳链球菌主要分离自老年患者，以CC10菌株为主，携带多种耐药基因和毒力基因，对大环内酯类、林可酰胺类和喹诺酮类药物耐药率高，提示需要密切关注老年患者呼吸道标本中无乳链球菌对健康的威胁。.
    [Abstract] [Full Text] [Related] [New Search]