RESUMO
Group B streptococci (GBS) infections occur worldwide. Although serotyping has been used for epidemiologic purposes, this does not accurately characterize enough members of a genetically heterogeneous bacterial population. The aims of this work were to evaluate the genetic diversity of 45 type Ia GBS strains isolated in Brazil by pulsed-field gel electrophoresis as well as to evaluate antimicrobial susceptibility profiles and identify virulence genes. Twenty-four strains were assigned to cluster A. All strains under study contained the hylB and scpB genes. The bca gene was detected in only 10 strains and none of the streptococci carried the bac gene. Thirty-nine strains were resistant to tetracycline.
Assuntos
Antibacterianos/farmacologia , DNA Viral/análise , Genes Virais/genética , Streptococcus agalactiae , Brasil , Testes de Sensibilidade a Antimicrobianos por Disco-Difusão , Eletroforese em Gel de Campo Pulsado , Variação Genética , Humanos , Streptococcus agalactiae/efeitos dos fármacos , Streptococcus agalactiae/genética , Streptococcus agalactiae/patogenicidade , Virulência/genéticaRESUMO
The aim of this work was to identify and characterize Clostridium difficile strains from fecal and hospital environmental samples. C. difficile toxins were detected by ELISA in 28.5% of the analyzed samples. Four strains were isolated from immunosuppressed inpatients presenting antibiotic-associated diarrhea. All strains possessed tcdA and tcdB genes and did not present neither the cdtA and cdtB genes nor any significant deletions in the tcdC gene. PFGE and PCR-ribotyping analysis showed that two strains belonged to the same clonal type (ribotype 014) and the other two were grouped into ribotype 106, in spite of presenting a similar, but not identical genetic fingerprint. This report shows that for the first time ribotype 106 was found outside the United Kingdom. All isolates were equally sensitive to metronidazole. The ribotype 014 isolates were highly resistant to clindamycin, while the ribotype 106 isolates were resistant to all fluoroquinolones tested. This work reveals the spread of C. difficile in the hospital unit studied and the presence of three genetically related types, two of them presenting resistance to fluoroquinolones.
Assuntos
Clostridioides difficile/isolamento & purificação , Infecção Hospitalar/microbiologia , Enterocolite Pseudomembranosa/microbiologia , Adulto , Antibacterianos/farmacologia , Toxinas Bacterianas/biossíntese , Toxinas Bacterianas/genética , Técnicas de Tipagem Bacteriana , Brasil , Clostridioides difficile/classificação , Clostridioides difficile/genética , Impressões Digitais de DNA , DNA Bacteriano/genética , Farmacorresistência Bacteriana , Eletroforese em Gel de Campo Pulsado , Microbiologia Ambiental , Fezes/microbiologia , Feminino , Genótipo , Hospitais , Humanos , Hospedeiro Imunocomprometido , Pacientes Internados , Masculino , Metronidazol/farmacologia , Pessoa de Meia-Idade , Epidemiologia Molecular , Ribotipagem , Adulto JovemRESUMO
Group B streptococci (GBS) infections occur worldwide. Although serotyping has been used for epidemiologic purposes, this does not accurately characterize enough members of a genetically heterogeneous bacterial population. The aims of this work were to evaluate the genetic diversity of 45 type Ia GBS strains isolated in Brazil by pulsed-field gel electrophoresis as well as to evaluate antimicrobial susceptibility profiles and identify virulence genes. Twenty-four strains were assigned to cluster A. All strains under study contained the hylB and scpB genes. The bca gene was detected in only 10 strains and none of the streptococci carried the bac gene. Thirty-nine strains were resistant to tetracycline.