ÿþ<HTML><HEAD><TITLE>XI International Meeting on Paracoccidioidomycosis</TITLE><link rel=STYLESHEET type=text/css href=css.css></HEAD><BODY aLink=#ff0000 bgColor=#FFFFFF leftMargin=0 link=#000000 text=#000000 topMargin=0 vLink=#000000 marginheight=0 marginwidth=0><table align=center width=700 cellpadding=0 cellspacing=0><tr><td align=left bgcolor=#cccccc valign=top width=550><font face=arial size=2><strong><font face=Verdana, Arial, Helvetica, sans-serif size=3><font size=1>XI International Meeting on Paracoccidioidomycosis</font></font></strong><font face=Verdana size=1><b><br></b></font><font face=Verdana, Arial,Helvetica, sans-serif size=1><strong> </strong></font></font></td><td align=right bgcolor=#cccccc valign=top width=150><font face=arial size=2><strong><font face=Verdana, Arial, Helvetica, sans-serif size=1><font size=1>Resume:57-1</font></em></font></strong></font></td></tr><tr><td colspan=2><br><br><table align=center width=700><tr><td><b>Oral / Poster</b><br><table width="100%"><tr><td width="60">57-1</td><td><b>In vitro evaluation of the susceptibility of Paracoccidioides brasiliensis to amphotericin B e azole compounds</b></td></tr><tr><td valign=top>Authors:</td><td>Adriana de Oliveira Afonso (FMRP-USP - Faculty of Medicine of Ribeirão Preto University of S. Paulo) ; Lúcia Helena Vitali (FMRP-USP - Faculty of Medicine of Ribeirão Preto University of S. Paulo) ; <u>Claudia Maria Leite Maffei </u> (FMRP-USP - Faculty of Medicine of Ribeirão Preto University of S. Paulo) ; Roberto Martinez (FMRP-USP - Faculty of Medicine of Ribeirão Preto University of S. Paulo) </td></tr></table><p align=justify><b><font size=2>Abstract</font></b><p align=justify class=tres><font size=2>INTRODUCTION - <i>In vitro</i> susceptibility tests for dimorphic fungi, especially <i>Paracoccidioides brasiliensis</i>, are scarce and the results are not always concordant. Assessing the sensitivity of <i>P. brasiliensis</i> to antifungal agents can be useful for the selection of drugs for empirical treatment and for individualized therapy in problematic cases. METHODOLOGY - We used the broth macrodilution test described in the M27-A2 document of the CLSI. We used 5 antifungal drugs in serial dilutions: amphotericin B and itraconazole (0.0156 to 16 µg/mL), ketoconazole (0.0078 to 16 µg/mL), fluconazole, and voriconazole (0.0625 to 64 µg/mL). We employed 23 clinical isolates of <i>P. brasiliensis</i>, yeast-like phase. The fungal inoculum was prepared in RPMI1640 supplemented or not with 2% glucose and adjusted to 1.0X104 Fungal Units/mL (FU/mL) for amphotericin B and to 1.0X105 FU/ml for the tests with the azole agents. The minimum inhibitory concentration (MIC) was determined after 7 days of incubation, being considered as the lowest drug concentration that inhibited 100% and 80% of test tube growth for amphotericin B and the azole compounds, respectively, compared to control tubes. RESULTS - The MICs ranged from 0.0312 to 0.25 µg/ml for amphotericin B, from < 0.0078 to 0.0625 µg/ml for ketoconazole, from < 0.0156 to 0.25 µg/ml for itraconazole, from < 0.0625 to 0.25 µg/ml for fluconazole, and from < 0.0625 to 0.125 µg/ml for voriconazole, with respective MIC90 values of 0.25 µg/ml, 0.0625 µg/ml, 0.0625 µg/ml, 0.25 µg/ml, and 0.125 µg/ml. CONCLUSION - The blood levels achieved with the usual therapeutic doses of the antifungal agents tested are much higher than the MICs detected <i>in vitro</i> in the present study. In the present study, as also reported in the literature, low MIC values were observed for ketoconazole and itraconazole. The MICs for fluconazole are usually higher than those obtained for ketoconazole and itraconazole. For <i>P. brasiliensis</i>, thes MICs for voriconazole and itraconazole were similar to and lower than the MIC for fluconazole, as also reported in the literature. SUPPORT - Research and Technological Development Unit (UPDT), National STD/AIDS Program.</font></p><br><b>Keyword: </b>&nbsp;Paracoccidioides brasiliensis, Susceptibility tests, Minimum inhibitory concentration, Amphotericin B, Azole compounds</td></tr></table></tr></td></table></body></html>