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lüll Virulence factors, antimicrobial susceptibility and molecular characterization of Streptococcus agalactiae isolated from pregnant women Beigverdi R; Jabalameli F; Mirsalehian A; Hantoushzadeh S; Boroumandi S; Taherikalani M; Emaneini MActa Microbiol Immunol Hung 2014[Dec]; 61 (4): 425-34Forty-one Streptococcus agalactiae isolates collected from pregnant women at 35-37 weeks of gestation were analysed for their capsular types, antimicrobial resistance determinants, distribution of virulence factors and genetic relatedness using PCR and multiplex PCR. Capsular type III was predominant (65.8%), followed by capsular type II (14.6%), Ib (7.3%), and V(4.9%). All isolates were susceptible to penicillin, vancomycin, linezolid and quinupristin-dalfopristin. Resistance to tetracycline, erythromycin and clindamycin were found in 97.6%, 24.4%, and 14.6% of isolates, respectively. The most common antimicrobial resistance gene was tetM found in 97.6% of the isolates followed by ermTR and ermB found in 12% and 7.3% of isolates, respectively. The most common virulence gene was hly (100%), followed by scpB (97.6%), bca (97.6%), rib (53.65%) and bac (4.9%). The insertion sequence IS1548 was found in 63.4% of isolates. By multi locus variable number of tandem repeat analysis (MLVA) typing, 30 different allelic profiles or MLVA types (MTs) were identified. The most frequent was the MT1 (5/41, 12.2%) and followed by MT2 (4/41, 9.75%). Our data revealed that population structure of these isolates is highly diverse and indicates different MLVA types.|Drug Resistance, Bacterial/genetics[MESH]|Female[MESH]|Genotype[MESH]|Humans[MESH]|Microbial Sensitivity Tests[MESH]|Polymerase Chain Reaction[MESH]|Pregnancy[MESH]|Streptococcus agalactiae/classification/*drug effects/genetics/pathogenicity[MESH]|Virulence Factors/*analysis/genetics[MESH] |