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ORIGINAL RESEARCH REPORT
Year : 2016  |  Volume : 13  |  Issue : 3  |  Page : 132-136

Antibiotic susceptibility/resistant gene profiles of Group B streptococci isolates from pregnant women in a tertiary institution in Nigeria


1 Department of Medical Microbiology and Parasitology, Ben Carson School of Medicine, Babcock University, Ilisan-Remo, Ogun State; Department of Medical Microbiology and Parasitology, Lagos University Teaching Hospital, Lagos, Nigeria
2 Department of Medical Microbiology and Parasitology, College of Medicine, University of Lagos, Lagos, Nigeria
3 Department of Obstetrics and Gynecology, College of Medicine, University of Lagos, Idi-Araba, Lagos, Nigeria
4 Institute of Medical Microbiology and Infection Epidemiology, University of Leipzig, Germany

Correspondence Address:
Charles J Elikwu
Department of Medical Microbiology and Parasitology, Ben Carson School of Medicine, Babcock University, Ilisan Remo, Ogun State
Nigeria
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2468-6859.185250

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Background: Penicillin is recommended as the first-line agent for intrapartum antibiotic prophylaxis (IAP). Although Group B Streptococcus (GBS) strains are generally susceptible to penicillin with only occasional resistance, they show varying resistance to erythromycin, clindamycin, and tetracycline. Therefore, knowledge of the resistance profile of GBS in the local environment will be useful for administration of appropriate intrapartum antibiotics prophylaxis. Methodology: Rectovaginal swabs collected from pregnant women were cultured for GBS using conventional media. Kirby-Bauer disc diffusion method was performed according to the Clinical and Laboratory Standards Institute guidelines on GBS isolates to determine the antibiotic susceptibility patterns of the isolates. Inducible clindamycin resistance was detected by using the D-zone test. Resistance determinants genes were discerned with conventional polymerase chain reaction. Results: Carriage rates of GBS among pregnant women studied were 19.7%. GBS colonizing the pregnant mothers were uniformly susceptible (100%) to penicillin, vancomycin, and ceftriaxone. Only three (6.5%) of the isolates showed inducible clindamycin resistance. ermA gene was present in all three GBS isolates with inducible macrolide-lincosamide-streptogramin resistance. ermB was absent in all the strains tested. mefA/E gene was carried by two of the macrolide-clindamycin resistance isolates. tetM gene was carried by all isolates with tetracycline resistance phenotypes. Conclusion: In this study, all GBS isolates were susceptible to penicillin G, the recommended antibiotic for IAP. The presence of resistance to erythromycin and inducible resistance to clindamycin excludes the use of these agents as alternatives in cases of penicillin allergy. In this case, vancomycin is the drug of choice as recommended in the updated Centers for Disease Control guideline.


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