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pubmed-article:19546368pubmed:abstractTextCandida biofilms are microbial communities, embedded in a polymeric matrix, growing attached to a surface, and are highly recalcitrant to antimicrobial therapy. These biofilms exhibit enhanced resistance against most antifungal agents except echinocandins and lipid formulations of amphotericin B. In this study, biofilm formation by different Candida species, particularly Candida albicans, C. tropicalis, and C. parapsilosis, was evaluated, and the effect of caspofungin (CAS) was assessed using a clinically relevant in vitro model system. CAS displayed in vitro activity against C. albicans and C. tropicalis cells within biofilms. Biofilm formation was evaluated after 48 h of antifungal drug exposure, and the effects of CAS on preformed Candida species biofilms were visualized using scanning electron microscopy (SEM). Several species-specific differences in the cellular morphologies associated with biofilms were observed. Our results confirmed the presence of paradoxical growth (PG) in C. albicans and C. tropicalis biofilms in the presence of high CAS concentrations. These findings were also confirmed by SEM analysis and were associated with the metabolic activity obtained by biofilm susceptibility testing. Importantly, these results suggest that the presence of atypical, enlarged, conical cells could be associated with PG and with tolerant cells in Candida species biofilm populations. The clinical implications of these findings are still unknown.lld:pubmed
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pubmed-article:19546368pubmed:authorpubmed-author:de ResendeM...lld:pubmed
pubmed-article:19546368pubmed:authorpubmed-author:DonlanR MRMlld:pubmed
pubmed-article:19546368pubmed:authorpubmed-author:StarlingC E...lld:pubmed
pubmed-article:19546368pubmed:authorpubmed-author:FerreiraJ A...lld:pubmed
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pubmed-article:19546368pubmed:dateRevised2010-9-27lld:pubmed
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pubmed-article:19546368pubmed:articleTitleBiofilm formation and effect of caspofungin on biofilm structure of Candida species bloodstream isolates.lld:pubmed
pubmed-article:19546368pubmed:affiliationDepartamento de Microbiologia, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil. jantgferr@hotmail.comlld:pubmed
pubmed-article:19546368pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:19546368pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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