Serotypes and antibiotic susceptibility of Streptococcus agalactiae strains isolated from invasive neonatal infections
1 Medical biology laboratory CHU Hussein Dey Hospital Parnet Algiers, Algeria.
2 Faculty of Pharmacy, Microbiology Laboratory, University of Algiers 1, Algeria.
Research Article
GSC Biological and Pharmaceutical Sciences, 2023, 22(03), 253–258.
Article DOI: 10.30574/gscbps.2023.22.3.0133
Publication history:
Received on 20 February 2023; revised on 28 March 2023; accepted on 31 March 2023
Abstract:
The purpose of the study: to determine the serotypes and antibiotic susceptibility of strains of streptococcus agalactiae isolated from invasive neonatal infections.
Material and methods: Fifty-five strains of Streptococcus agalactiae were selected isolated from invasive cerebrospinal fluid (CSF) and blood infections. The strains were confirmed by the Api 20Strep galleries and tested against the following antibiotics: penicillin G, ampicillin, erythromycin, clindamycin, tetracycline, ofloacin, levofloacin, gentamycin 500 μg, quinpristin-dalfopristin, chloramphenicol, vancomycin, interpretation was carried out according to the recommendations of the CLSI 2020 and kanamycin 1000 μg was interpreted according to the Ca-SFM standards. The serotyping of the strains was carried out according to the protocol of Monica Impéri
Results: All strains were sensitive to penicillin G and ampicillin as well as vancomycin and fluoroquinolone; 92.7% are resistant to tetracyclines, 34.5% to erythromycin, 32.7% to clindamycin, 27.3% to chloramphenicol and 25.5% to kanamycin. The distribution of serotypes was as follows: serotype III is the majority with 56.4% followed by serotype Ia with 21.8% then serotype V with 14.5%.
Conclusion: The strains of Streptococcus agalactiae remain sensitive to betalactamines, resistance to macrolides was around 35%, whereas that of aminoglycosides was 25%.Serotype III is the main serotype in invasive strains
Keywords:
Streptococcus agalactiae; antibiotic resistance; serotype III; invasive strains
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Copyright © 2023 Author(s) retain the copyright of this article. This article is published under the terms of the Creative Commons Attribution Liscense 4.0
