title: Biotypes of oral Candida albicans isolated from AIDS patients and HIV-free subjects in Thailand.
abstract: This study was conducted to examine biotypes and antifungal susceptibility patterns of oral Candida albicans isolated from HIV-infected patients, HIV-free patients with candidiasis and healthy subjects. All isolates were biotyped using a typing system based on enzyme profiles, carbohydrate assimilation patterns and boric acid resistance. Thirty-eight biotypes were found amongst 218 oral C. albicans isolates. The major biotype found was A1S, which accounted for 32.6% of all isolates, and this biotype was the most common in all groups. There was a greater variety of biotypes of C. albicans in the HIV-infected group than in the other groups; however, there was no statistically significant difference between the groups. The minimum inhibitory concentrations (MICs) of a total of 118 isolates were determined for amphotericin B and for ketoconazole using the National Committee for Clinical Laboratory Standards (NCCLS) broth macrodilution method and the E-test. When the antifungal susceptibility patterns among the groups were compared, a statistically significant difference was found only with amphotericin B. The median MIC of amphotericin B in the HIV-infected group was higher than in the healthy group (P=0.013, NCCLS method; P=0.002, E-test). However, this difference in sensitivity was not restricted to any sub-type investigated. Our results showed that the biotype patterns of C. albicans isolates that colonize HIV-infected patients are similar to those of HIV-free subjects, and there is no relationship between antifungal susceptibility patterns and the biotypes.
authors.affiliation: Department of Stomatology, Faculty of Dentistry, Prince of Songkla University, Hat-Yai, Thailand.
authors.forename: R
authors.initials: R
authors.lastname: Teanpaisan
authors.forename: W
authors.initials: W
authors.lastname: Nittayananta
authors.forename: V
authors.initials: V
authors.lastname: Chongsuvivatwong
mesh_terms: D017088:AIDS-Related Opportunistic Infections / Q000188:drug therapy / Q000382:microbiology*; D000666:Amphotericin B / Q000008:administration & dosage; D002176:Candida albicans / Q000145:classification* / Q000187:drug effects; D002180:Candidiasis, Oral / Q000188:drug therapy / Q000382:microbiology*; D004305:Dose-Response Relationship, Drug; D018023:HIV Seronegativity; D006801:Humans; D007654:Ketoconazole / Q000008:administration & dosage; D008826:Microbial Sensitivity Tests; D016533:Mycological Typing Techniques; D012463:Saliva / Q000382:microbiology
chemical_list: D000666:Amphotericin B; D007654:Ketoconazole