Laboratory Medicine ›› 2024, Vol. 39 ›› Issue (4): 382-386.DOI: 10.3969/j.issn.1673-8640.2024.04.012

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Relation of drug resistance,serotypes and genotypes of Group B Streptococcus in perinatal pregnant females and pregnancy outcomes

ZHAO Yanan, XIAO Weili(), CAO Qixin, YAN Yan, CUI Xiuge, ZHAO Jianping   

  1. Department of Clinical Laboratory,Inner Mongolia People's Hospital,Hohhot 010010,Inner Mongolia,China
  • Received:2023-05-08 Revised:2023-09-11 Online:2024-04-30 Published:2024-05-07

Abstract:

Objective To analyze the correlation of drug resistance,serotypes and genotypes of Group B Streptococcus(GBS) in perinatal pregnant females and pregnancy outcomes,and to provide a reference for clinical drug use and vaccine development. Methods A total of 123 GBS positive perinatal pregnant females(study group) and 123 GBS negative pregnant females(control group) were enrolled from January 2020 to December 2022 in Inner Mongolia People's Hospital. The pregnancy outcome of the 2 groups was compared. The drug susceptibility of GBS was analyzed in vitro. Serotyping and genotyping of GBS were performed by latex agglutination and multi-locus sequence typing(MLST). The correlation between drug resistance and pathogenicity of GBS in different serotypes and genotypes was analyzed. Results The susceptibility rates of GBS to vancomycin,quinupristin-dafoputin,linezolid,gentamicin,ampicillin,penicillin and ceftriaxone were all >91.00%,and they were resistant to furantoin,levofloxacin,clindamycin and erythromycin in different degrees. The serotypes of GBS were mainly type Ⅲ,Ⅰb and Ⅰa,and the genotypes were mainly ST19,ST17 and ST23. Type Ⅲ GBS genotypes were mainly ST19 and ST17,type Ⅰb was mainly ST10 and ST12,and type Ⅰa was mainly ST23. Type Ⅲ,type Ⅰa and ST19,ST17 GBS had the highest resistance rate to erythromycin,and the difference in resistance rate to furantoin,levofloxacin,clindamycin and erythromycin was statistically significant(P<0.05). The drug resistance rate of different serotypes of GBS to furantoin,levofloxacin,clindamycin and erythromycin was statistically significant(P<0.05),and the drug resistance rate of type Ⅲ GBS to the 4 antibiotics was the highest. The study group was more likely to have adverse pregnancy outcomes(P<0.05). The incidence of type Ⅰa and ST23 GBS was higher in pregnant females. Type Ⅲ GBS clones mostly caused invasive infection in neonates,and ST17 was the main type. Conclusions GBS is highly sensitive to penicillins,cephalosporins and vancomycin. The main serotypes of GBS are type Ⅲ,type Ⅰa and type Ⅰb,and the main genotypes are ST19,ST17 and ST23. GBS infection is more likely to cause adverse pregnancy outcomes,type Ⅰa and ST23 GBS are more likely to cause colonization infection in pregnant females,and type Ⅲ and ST17 GBS are more likely to cause invasive infection in neonates.

Key words: Group B Streptococcus, Serotype, Genotype, Drug resistance, Pregnancy outcome

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