IMR Press / CEOG / Volume 48 / Issue 2 / DOI: 10.31083/j.ceog.2021.02.2242
Open Access Rapid Communication
Identification and characteristics of antimicrobial-resistant Group B Streptococcus isolated from maternal birth canals at a university-affiliated hospital, China
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1 Department of Reproductive Medicine, Associated Hospital, Beihua University, 132000 Jilin, Jilin, China
2 Department of Clinical Diagnosis, School of Laboratory Medicine, Beihua University, 132013 Jilin, Jilin, China
Clin. Exp. Obstet. Gynecol. 2021, 48(2), 253–256;
Submitted: 28 July 2020 | Revised: 7 September 2020 | Accepted: 23 September 2020 | Published: 15 April 2021
Copyright: © 2021 The Authors. Published by IMR Press.
This is an open access article under the CC BY 4.0 license (

Purpose of investigation: This study aimed to ascertain the colonization rate of Group B Streptococcus (GBS) in the birth canals of late-pregnant women, and to demonstrate the characteristics of the origins of antibiotic-resistance. Materials and Methods: A prospective survey of pregnant women from 2017 to 2019 at a university-affiliated hospital in China was conducted. A total of 275 pregnant women with a pregnancy between 35 and 37 weeks were included in the study. Vaginal secretions and rectal swabs were tested by GBS separation to identify cultures, and an agar doubling dilution method was performed to assess drug sensitivity. Results: In 275 pregnant women, 20 cases were GBS screen-positive for the vaginal swabs with a GBS colonization rate of 7.27%. In addition, 16 isolates from the rectal swabs were also GBS screen-positive. Of 20 isolates from the vaginal swabs, 90.0% were resistant to tetracycline, 70.0% were resistant to erythromycin, 40.0% were resistant to clindamycin, 40.0% were resistant to levofloxacin and 30.0% resistant to chloromycetin. All isolates were susceptible to penicillin G, vancomycin, and linezolid. Conclusions: The higher prevalence of GBS colonization among pregnant women indicated the critical need for screening GBS colonization in late-pregnant women in the region. The study revealed the resistant patterns of GBS colonization and inferred a possible mechanism of the GBS resistance to antimicrobial agents used as animal growth promotion substances.

Group B Streptococcus
Pregnant woman
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