Biofilm production in oralCandidaisolates from HIV-positive individuals from Pune, India

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Biofilm formation is implicated as a potential virulence factor in Candida species and carries important clinical repercussions because of their increased resistance to antifungal treatment, ability to withstand host defences and to serve as a reservoir for continuing infections. The present study was undertaken to determine the biofilm production among oral Candida isolates from HIV-positive and HIV-negative individuals from Pune, India. Biofilm formation was determined using the spectrophotometric or microtitre plate method in 182 Candida isolates, of which 154 were from HIV-positive and 28 were from HIV-negative individuals. A total of 63.2% of the Candida isolates were biofilm producers. Significantly increased biofilm forming abilities both qualitatively as well as quantitatively were observed in Candida isolates from HIV-positive individuals (66.2%) compared to isolates from HIV-negative ones (46.4%), (P– 0.041). Eighty-one (59.6%) C. albicans isolates and 34 (73.9%) non –C. albicans Candida (NCAC) showed biofilm positivity. The NCAC showed significantly greater intensity of biofilm formation compared to the C. albicans, P– 0.032. Our results thus show the enhanced biofilm forming abilities of oral Candida isolates from HIV-infected individuals compared to HIV-uninfected ones and highlight the important role played by biofilm formation in the pathogenesis of NCAC isolates.

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