Process analysis of variables for standardization of antifungal susceptibility testing of nonfermentative yeasts
ABSTARCT: Nonfermentative yeasts, such as Cryptococcus spp., have emerged as fungal pathogens during the last few years. However, standard methods to measure their antifungal susceptibility (antifungal susceptibility testing [AST]) are not completely reliable due to the impaired growth of these yeas...
- Autores:
-
Zaragoza, Oscar
Mesa Arango, Ana Cecilia
Gomez Lopez, Alicia
Bernal Martinez, Leticia
Rodriguez Tudela, Juan Luis
Cuenca Estrella, Manuel
- Tipo de recurso:
- Article of investigation
- Fecha de publicación:
- 2011
- Institución:
- Universidad de Antioquia
- Repositorio:
- Repositorio UdeA
- Idioma:
- eng
- OAI Identifier:
- oai:bibliotecadigital.udea.edu.co:10495/11717
- Acceso en línea:
- http://hdl.handle.net/10495/11717
- Palabra clave:
- Antifungal Agents
Cryptococcus
Cryptococcus neoformans
drug effects
Geotrichum
Microbial Sensitivity Tests
Rhodotorula
pharmacology
Trichosporon
Yarrowia
Antifúngicos
Farmacología
Pruebas de Sensibilidad Microbiana
- Rights
- openAccess
- License
- Atribución 2.5
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|
dc.title.spa.fl_str_mv |
Process analysis of variables for standardization of antifungal susceptibility testing of nonfermentative yeasts |
title |
Process analysis of variables for standardization of antifungal susceptibility testing of nonfermentative yeasts |
spellingShingle |
Process analysis of variables for standardization of antifungal susceptibility testing of nonfermentative yeasts Antifungal Agents Cryptococcus Cryptococcus neoformans drug effects Geotrichum Microbial Sensitivity Tests Rhodotorula pharmacology Trichosporon Yarrowia Antifúngicos Farmacología Pruebas de Sensibilidad Microbiana |
title_short |
Process analysis of variables for standardization of antifungal susceptibility testing of nonfermentative yeasts |
title_full |
Process analysis of variables for standardization of antifungal susceptibility testing of nonfermentative yeasts |
title_fullStr |
Process analysis of variables for standardization of antifungal susceptibility testing of nonfermentative yeasts |
title_full_unstemmed |
Process analysis of variables for standardization of antifungal susceptibility testing of nonfermentative yeasts |
title_sort |
Process analysis of variables for standardization of antifungal susceptibility testing of nonfermentative yeasts |
dc.creator.fl_str_mv |
Zaragoza, Oscar Mesa Arango, Ana Cecilia Gomez Lopez, Alicia Bernal Martinez, Leticia Rodriguez Tudela, Juan Luis Cuenca Estrella, Manuel |
dc.contributor.author.none.fl_str_mv |
Zaragoza, Oscar Mesa Arango, Ana Cecilia Gomez Lopez, Alicia Bernal Martinez, Leticia Rodriguez Tudela, Juan Luis Cuenca Estrella, Manuel |
dc.subject.none.fl_str_mv |
Antifungal Agents Cryptococcus Cryptococcus neoformans drug effects Geotrichum Microbial Sensitivity Tests Rhodotorula pharmacology Trichosporon Yarrowia Antifúngicos Farmacología Pruebas de Sensibilidad Microbiana |
topic |
Antifungal Agents Cryptococcus Cryptococcus neoformans drug effects Geotrichum Microbial Sensitivity Tests Rhodotorula pharmacology Trichosporon Yarrowia Antifúngicos Farmacología Pruebas de Sensibilidad Microbiana |
description |
ABSTARCT: Nonfermentative yeasts, such as Cryptococcus spp., have emerged as fungal pathogens during the last few years. However, standard methods to measure their antifungal susceptibility (antifungal susceptibility testing [AST]) are not completely reliable due to the impaired growth of these yeasts in standard media. In this work, we have compared the growth kinetics and the antifungal susceptibilities of representative species of nonfermentative yeasts such as Cryptococcus neoformans, Cryptococcus gattii, Cryptococcus albidus, Rhodotorula spp., Yarrowia lipolytica, Geotrichum spp., and Trichosporon spp. The effect of the growth medium (RPMI medium versus yeast nitrogen base [YNB]), glucose concentration (0.2% versus 2%), nitrogen source (ammonium sulfate), temperature (30°C versus 35°C), shaking, and inoculum size (10(3), 10(4), and 10(5) cells) were analyzed. The growth rate, lag phase, and maximum optical density were obtained from each growth experiment, and after multivariate analysis, YNB-based media demonstrated a significant improvement in the growth of yeasts. Shaking, an inoculum size of 10(5) CFU/ml, and incubation at 30°C also improved the growth kinetics of organisms. Supplementation with ammonium sulfate and with 2% glucose did not have any effect on growth. We also tested the antifungal susceptibilities of all the isolates by the reference methods of the CLSI and EUCAST, the EUCAST method with shaking, YNB under static conditions, and YNB with shaking. MIC values obtained under different conditions showed high percentages of agreement and significant correlation coefficient values between them. MIC value determinations according to CLSI and EUCAST standards were rather complicated, since more than half of isolates tested showed a limited growth index, hampering endpoint determinations. We conclude that AST conditions including YNB as an assay medium, agitation of the plates, reading after 48 h of incubation, an inoculum size of 10(5) CFU/ml, and incubation at 30°C made MIC determinations easier without an overestimation of MIC values. |
publishDate |
2011 |
dc.date.issued.none.fl_str_mv |
2011 |
dc.date.accessioned.none.fl_str_mv |
2019-08-22T20:43:17Z |
dc.date.available.none.fl_str_mv |
2019-08-22T20:43:17Z |
dc.type.spa.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.coarversion.fl_str_mv |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
dc.type.hasversion.spa.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.coar.spa.fl_str_mv |
http://purl.org/coar/resource_type/c_2df8fbb1 |
dc.type.redcol.spa.fl_str_mv |
https://purl.org/redcol/resource_type/ART |
dc.type.local.spa.fl_str_mv |
Artículo de investigación |
format |
http://purl.org/coar/resource_type/c_2df8fbb1 |
status_str |
publishedVersion |
dc.identifier.citation.spa.fl_str_mv |
Zaragoza O, Mesa-Arango AC, Gómez-López A, Bernal-Martínez L, Rodríguez-Tudela JL, Cuenca-Estrella M. Process analysis of variables for standardization of antifungal susceptibility testing of nonfermentative yeasts. Antimicrob Agents Chemother. 2011 Apr;55(4):1563-70 |
dc.identifier.issn.none.fl_str_mv |
0066-4804 |
dc.identifier.uri.none.fl_str_mv |
http://hdl.handle.net/10495/11717 |
dc.identifier.doi.none.fl_str_mv |
10.1128/AAC.01631-10 |
dc.identifier.eissn.none.fl_str_mv |
1098-6596 |
identifier_str_mv |
Zaragoza O, Mesa-Arango AC, Gómez-López A, Bernal-Martínez L, Rodríguez-Tudela JL, Cuenca-Estrella M. Process analysis of variables for standardization of antifungal susceptibility testing of nonfermentative yeasts. Antimicrob Agents Chemother. 2011 Apr;55(4):1563-70 0066-4804 10.1128/AAC.01631-10 1098-6596 |
url |
http://hdl.handle.net/10495/11717 |
dc.language.iso.spa.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartofjournalabbrev.spa.fl_str_mv |
Antimicrob Agents Chemother |
dc.rights.*.fl_str_mv |
Atribución 2.5 |
dc.rights.spa.fl_str_mv |
info:eu-repo/semantics/openAccess |
dc.rights.uri.*.fl_str_mv |
http://creativecommons.org/licenses/by/2.5/co/ |
dc.rights.accessrights.spa.fl_str_mv |
http://purl.org/coar/access_right/c_abf2 |
dc.rights.creativecommons.spa.fl_str_mv |
https://creativecommons.org/licenses/by/4.0/ |
rights_invalid_str_mv |
Atribución 2.5 http://creativecommons.org/licenses/by/2.5/co/ http://purl.org/coar/access_right/c_abf2 https://creativecommons.org/licenses/by/4.0/ |
eu_rights_str_mv |
openAccess |
dc.format.extent.spa.fl_str_mv |
7 |
dc.format.mimetype.spa.fl_str_mv |
application/pdf |
dc.publisher.spa.fl_str_mv |
American Society for Microbiology |
dc.publisher.group.spa.fl_str_mv |
Grupo de Investigacion Dermatologica (GRID) |
dc.publisher.place.spa.fl_str_mv |
Estados Unidos |
institution |
Universidad de Antioquia |
bitstream.url.fl_str_mv |
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andres.perez@udea.edu.co |
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spelling |
Zaragoza, OscarMesa Arango, Ana CeciliaGomez Lopez, AliciaBernal Martinez, LeticiaRodriguez Tudela, Juan LuisCuenca Estrella, Manuel2019-08-22T20:43:17Z2019-08-22T20:43:17Z2011Zaragoza O, Mesa-Arango AC, Gómez-López A, Bernal-Martínez L, Rodríguez-Tudela JL, Cuenca-Estrella M. Process analysis of variables for standardization of antifungal susceptibility testing of nonfermentative yeasts. Antimicrob Agents Chemother. 2011 Apr;55(4):1563-700066-4804http://hdl.handle.net/10495/1171710.1128/AAC.01631-101098-6596ABSTARCT: Nonfermentative yeasts, such as Cryptococcus spp., have emerged as fungal pathogens during the last few years. However, standard methods to measure their antifungal susceptibility (antifungal susceptibility testing [AST]) are not completely reliable due to the impaired growth of these yeasts in standard media. In this work, we have compared the growth kinetics and the antifungal susceptibilities of representative species of nonfermentative yeasts such as Cryptococcus neoformans, Cryptococcus gattii, Cryptococcus albidus, Rhodotorula spp., Yarrowia lipolytica, Geotrichum spp., and Trichosporon spp. The effect of the growth medium (RPMI medium versus yeast nitrogen base [YNB]), glucose concentration (0.2% versus 2%), nitrogen source (ammonium sulfate), temperature (30°C versus 35°C), shaking, and inoculum size (10(3), 10(4), and 10(5) cells) were analyzed. The growth rate, lag phase, and maximum optical density were obtained from each growth experiment, and after multivariate analysis, YNB-based media demonstrated a significant improvement in the growth of yeasts. Shaking, an inoculum size of 10(5) CFU/ml, and incubation at 30°C also improved the growth kinetics of organisms. Supplementation with ammonium sulfate and with 2% glucose did not have any effect on growth. We also tested the antifungal susceptibilities of all the isolates by the reference methods of the CLSI and EUCAST, the EUCAST method with shaking, YNB under static conditions, and YNB with shaking. MIC values obtained under different conditions showed high percentages of agreement and significant correlation coefficient values between them. MIC value determinations according to CLSI and EUCAST standards were rather complicated, since more than half of isolates tested showed a limited growth index, hampering endpoint determinations. We conclude that AST conditions including YNB as an assay medium, agitation of the plates, reading after 48 h of incubation, an inoculum size of 10(5) CFU/ml, and incubation at 30°C made MIC determinations easier without an overestimation of MIC values.7application/pdfengAmerican Society for MicrobiologyGrupo de Investigacion Dermatologica (GRID)Estados Unidosinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_2df8fbb1https://purl.org/redcol/resource_type/ARTArtículo de investigaciónhttp://purl.org/coar/version/c_970fb48d4fbd8a85Atribución 2.5info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/2.5/co/http://purl.org/coar/access_right/c_abf2https://creativecommons.org/licenses/by/4.0/Antifungal AgentsCryptococcusCryptococcus neoformansdrug effectsGeotrichumMicrobial Sensitivity TestsRhodotorulapharmacologyTrichosporonYarrowiaAntifúngicosFarmacologíaPruebas de Sensibilidad MicrobianaProcess analysis of variables for standardization of antifungal susceptibility testing of nonfermentative yeastsAntimicrob Agents ChemotherAntimicrobial Agents and Chemotherapy15631570554ORIGINALZaragozaOscar_2011_ProcessStandardizationAntifungal.pdfZaragozaOscar_2011_ProcessStandardizationAntifungal.pdfArtículo de Revistaapplication/pdf987981http://bibliotecadigital.udea.edu.co/bitstream/10495/11717/1/ZaragozaOscar_2011_ProcessStandardizationAntifungal.pdfa8688df95aab9460e95a8c8f6e6bc981MD51CC-LICENSElicense_urllicense_urltext/plain; charset=utf-849http://bibliotecadigital.udea.edu.co/bitstream/10495/11717/2/license_url4afdbb8c545fd630ea7db775da747b2fMD52license_textlicense_texttext/html; charset=utf-80http://bibliotecadigital.udea.edu.co/bitstream/10495/11717/3/license_textd41d8cd98f00b204e9800998ecf8427eMD53license_rdflicense_rdfLicenciaapplication/rdf+xml; charset=utf-80http://bibliotecadigital.udea.edu.co/bitstream/10495/11717/4/license_rdfd41d8cd98f00b204e9800998ecf8427eMD54LICENSElicense.txtlicense.txttext/plain; charset=utf-81748http://bibliotecadigital.udea.edu.co/bitstream/10495/11717/5/license.txt8a4605be74aa9ea9d79846c1fba20a33MD5510495/11717oai:bibliotecadigital.udea.edu.co:10495/117172021-04-01 13:42:11.696Repositorio Institucional Universidad de Antioquiaandres.perez@udea.edu.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 |