Renata Perugini Biasi-Garbin scite author profile

Streptococcus agalactiae (group B streptococci (GBS)) is an important infections agent in newborns associated with maternal vaginal colonization. Intrapartum antibiotic prophylaxis in GBS-colonized pregnant women has led to a significant reduction in the incidence of early neonatal infection in various geographic regions. However, this strategy may lead to resistance selecting among GBS, indicating the need for new alternatives to prevent bacterial transmission and even to treat GBS infections. This study reported for the first time the effect of eugenol on GBS isolated from colonized women, alone and in combination with silver nanoparticles produced by Fusarium oxysporum (AgNPbio). Eugenol showed a bactericidal effect against planktonic cells of all GBS strains, and this effect appeared to be time-dependent as judged by the time-kill curves and viability analysis. Combination of eugenol with AgNPbio resulted in a strong synergistic activity, significantly reducing the minimum inhibitory concentration values of both compounds. Scanning and transmission electron microscopy revealed fragmented cells and changes in bacterial morphology after incubation with eugenol. In addition, eugenol inhibited the viability of sessile cells during biofilm formation and in mature biofilms. These results indicate the potential of eugenol as an alternative for controlling GBS infections.

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Antifungal Potential of Plant Species From Brazilian Caatinga Against Dermatophytes

Biasi-Garbin

Demitto

Amaral

et al. 2016

Rev. Inst. Med. trop. S. Paulo

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Trichophyton rubrum and Trichophyton mentagrophytes complex, or Trichophyton spp. are the main etiologic agents of dermatophytosis, whose treatment is limited by the high cost of antifungal treatments, their various side effects, and the emergence of resistance amongst these species. This study evaluated the in vitro antidermatophytic activity of 23 crude extracts from nine plant species of semiarid vegetation (caatinga) found in Brazil. The extracts were tested at concentrations ranging from 1.95 to 1,000.0 mg/mL by broth microdilution assay against the reference strains T. rubrum ATCC 28189 and T. mentagrophytesATCC 11481, and 33 clinical isolates of dermatophytes. All plants showed a fungicidal effect against both fungal species, with MIC/MFC values of the active extracts ranging from 15.6 to 250.0 µg/mL. Selected extracts of Eugenia uniflora (AcE), Libidibia ferrea (AE), and Persea americana (AcE) also exhibited a fungicidal effect against all clinical isolates of T. rubrum and T. mentagrophytes complex. This is the first report of the antifungal activity of Schinus terebinthifolius, Piptadenia colubrina, Parapiptadenia rigida, Mimosa ophthalmocentra, and Persea americana against both dermatophyte species.

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Antibacterial Combination of Oleoresin from Copaifera multijuga Hayne and Biogenic Silver Nanoparticles Towards Streptococcus agalactiae

Otaguiri¹,

Morguette²,

Biasi-Garbin³

et al. 2017

CPB

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Emergência de Staphylococcus aureus resistentes aos antimicrobianos: um desafio contínuo

Oliveira

Morey

Biasi-Garbin

et al. 2015

cmbio

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Objetivo: Descrever o conhecimento atual dos principais mecanismos de resistência aos β-lactâmicos e glicopeptídeos apresentados por Staphylococcus aureus. Metodologia: Foram selecionados artigos de pesquisa originais e de revisão disponíveis nas bases de dados PubMed, Portal Periódicos CAPES e SCIELO. Os seguintes descritores foram utilizados: methicillin-resistant Staphylococcus aureus (MRSA), MRSA infection, vancomycin-intermediate S. aureus (VISA), heterogeneous-VISA (hVISA), staphylococcal cassete chromosome mec (SCCmec). A seleção dos artigos foi baseada em dois critérios: 1) publicação entre os anos 2000 e 2014 (até a data de submissão); 2) artigos cujos autores contribuíram com descobertas relevantes sobre os temas, independente do ano de publicação. Resultados: As consultas realizadas nos bancos de dados resultaram em 268 artigos, dos quais 59 foram utilizados para escrita dessa revisão. Conclusão: As comunidades, médica e científica, são constantemente desafiadas com a emergência de bactérias resistentes aos antimicrobianos. MRSA continua sendo um grande problema de saúde pública no mundo todo. Resistência aos glicopeptídeos (vancomicina e teicoplanina), uma das últimas escolhas para o tratamento intravenoso de infecções causadas por cepas de MRSA também tem sido descrita. A partir deste novo cenário, observou-se o surgimento de VRSA (vancomycin-resistant S. aureus), VISA (vancomycin-intermediate S. aureus) e hVISA (heterogeneous-VISA). Esses dados indicam a necessidade urgente de adoção de métodos mais sensíveis e rigorosos para detecção dessas cepas no laboratório de microbiologia clínica. Esta medida pode contribuir no sucesso do tratamento e prevenção de infecções causadas por essas bactérias.

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