Group B Streptococcus (GBS) infection is a potential aetiology of meningitis and septicemia in neonates, pregnant women and non-pregnant adults. Because the GBS disease burden is unknown in Malaysia, it is unlikely to receive much attention. This study aims to determine the prevalence of group B streptococcus isolated from non-pregnant adults, the Incidence, case-fatality ratio, antimicrobial susceptibility patterns, serotyping, genotyping and detection of the GBS virulence and pili genes from six major hospitals in Peninsular Malaysia.
This multicentre, prospective, observational study will be conducted in six major tertiary hospitals in Malaysia among Non-Pregnant Adults. At the same time, a retrospective study will be conducted on the selected hospitals to determine GBS strains and data. GBS isolates will be subjected to phenotyping, serotyping using Multiplex PCR, antimicrobial susceptibility testing and detection of GBS virulence and pilus genes. Seven housekeeping genes will be sequenced internally to perform multi-locus sequence typing (MLST). Findings from the study will contribute to improving clinical practice to diagnose and prevent GBS disease on time. The prudent use of antibiotics will be encouraged by monitoring antimicrobial resistance.
Study Type
OBSERVATIONAL
Enrollment
133
No Intervention in This study
Faculty of Medicine and Health Sciences
Serdang, Selangor, Malaysia
RECRUITINGTo examine the prevalence of invasive GBS illness among non-pregnant people in Malaysia.
. The researcher will verify the participants' medical records. Data on demographic data, clinical information, and information about the treatment and diagnosis initiated by the attending physician will be collected from patient's medical records from the selected hospitals.
Time frame: 18 months
To examine the prevalence of antibiotic resistance of invasive GBS isolates among non-pregnant people in Malaysia.
The disc diffusion (Kirby-Bauer) method will be used to determine the antimicrobial susceptibility of the GBS isolates to penicillin, ampicillin, clindamycin, erythromycin, vancomycin, tetracycline, azithromycin, ceftriaxone, cefotaxime, cefepime, ofloxacin, chloramphenicol, linezolid (Oxoid, Basingstoke, UK). Meanwhile, the E-test method will be used to determine the minimal inhibitory concentrations (MIC) of resistant strains. The diameter of inhibition zones will be measured, and MIC will be read based on the recently stated CLSI guideline (Clinical and Laboratory Standards Institute (CLSI), 2022).
Time frame: 2 months
Detection of GBS Virulence and Pilus Genes
GBS virulence (cfb, cylE, lmb, scpB, hylB, rib, fbsA, fbsB, spb1, bca and bac) and pili genes (PI-1, PI-2a and PI-2b) will be amplified using PCR that performed on a BioRadMyCyclerTM Thermal Cycler (BioRad, Massachusetts, USA) using the primers and running conditions published previously
Time frame: 3 months
Detection of Capsular polysaccharides types of GBS using Multiplex PCR
GBS capsular serotypes will be deduced by the multiplex PCR method. Ten serotypes (Ia, Ib and II - IX) will be determined by targeting the cps gene cluster, including cpsL, cpsG, cpsJ-Ib, cpsJ-2, cpsG-3-6, cpsJ-4, cpsN-5, cpsI-6, cpsI-7, cpsJ-8, and cpsI-9 genes using published primers according to the study by Imperi et al. (2010).
Time frame: 3 months
Detection of Sequence Type (ST)
Multi-locus sequence typing (MLST) will be performed by sequencing the internal fragments of seven housekeeping genes (ashP, pheS, atr, glnA, sdhA, glcK and tkt), as previously described (Jones et al., 2003). The sequences of the seven housekeeping genes will be trimmed and aligned using Molecular Evolutionary Genetics Analysis version 7 (MEGA 7) software according to known alleles base pair as described in the MLST database website (http://pubmlst.org/) in order to determine the allelic number and sequence type (ST).
Time frame: 3 mnths
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