ArticleInfection and drug resistance2026
Molecular Epidemiology and Antimicrobial Resistance of Group B
Article in Infection and drug resistance, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Group B Methods: A retrospective analysis was conducted on patients with GBS isolated from clinical specimens at Hainan General Hospital between June 2020 and September 2023. Antimicrobial susceptibility testing was performed using the Vitek 2 Compact system. Capsular serotyping and multilocus sequence typing (MLST) were conducted via whole-genome sequencing. Results: Among 95 patients with GBS isolated from clinical specimens, 62 (65.3%) were perinatal cases, including 10 confirmed neonatal infections. GBS was isolated from fetal appendageal tissues (placenta, amniotic fluid, and umbilical cord) in 57 perinatal cases. The remaining 33 were non-pregnant adults (mean age 51.8 years), of whom 84.8% had underlying diseases, and urinary tract infection was the most common diagnosis (75.8%). The predominant serotypes were III (36.8%), V (30.5%), and Ib (10.5%). The main sequence types included ST529 (15.8%), ST862 (15.8%), ST1 (13.7%), and ST19 (11.6%). All isolates were susceptible to penicillin and ampicillin, whereas resistance to tetracycline was 96.8%. Conclusion: This single-center retrospective study provides the first WGS-based molecular epidemiological data from Hainan. GBS infections in Hainan predominantly affect perinatal women and non-pregnant adults with comorbidities. Serotypes III, V, and Ib are the most prevalent. Penicillins retain excellent activity and remain the first-line treatment, whereas tetracycline is not recommended due to near-ubiquitous resistance.
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