title: Borelli's lactritmel agar induces conidiation in rare-macroconidia producing dermatophytic fungi.
abstract: Macroconidia are among the most important indicators used to identify dermatophytic fungi, but several do not usually sporulate and/or produce macroconidia on Sabouraud glucose agar. Specifically, Microsporum audouinii, M. ferrugineum, Trichophyton concentricum, T. schoenleinii, T. verrucosum, and T. violaceum (including T. soudanense and T. yaoundei) rarely form macroconidia and, therefore, cannot be easily identified. In this study, we investigated the production of macroconidia on nine common laboratory media, including Borelli's lactritmel agar (BLA), modified Borelli's lactritmel agar (MBLA), brain heart infusion agar (BHIA), Christensen's urease agar in Petri dishes (UPA), cornmeal dextrose agar (CMDA), Lowenstein-Jensen agar (LJA), malt extract agar (MEA), oatmeal agar (OA), and potato dextrose agar (PDA). The performance of these media was evaluated using 18 rare-macroconidia producing isolates, including representative of the six species mentioned above. All cultures in this study were incubated at 26°C on the bench, and conidia formation on each was investigated at 5, 10, 15, 20, 25, and 30 days of incubation. BLA apparently improved macroconidia production after 15 days and was the most useful nutrient agar medium to induce these phenotypic characters in daily practice, closely followed by OA, PDA, and MBLA.
authors.affiliation: Division of Mycology, Department of Microbiology, Faculty of Medicine, University of Çukurova, Adana, Turkey. milkit@cu.edu.tr
authors.forename: Macit
authors.initials: M
authors.lastname: Ilkit
authors.forename: Ramazan
authors.initials: R
authors.lastname: Gümral
authors.forename: Aylin
authors.initials: A
authors.lastname: Döğen
mesh_terms: D000362:Agar; D003883:Arthrodermataceae / Q000166:cytology / Q000254:growth & development*; D003470:Culture Media / Q000737:chemistry*; D006801:Humans; D025301:Hyphae / Q000166:cytology / Q000254:growth & development*; D009172:Mycology / Q000379:methods*; D013172:Spores, Fungal / Q000166:cytology / Q000254:growth & development; D013696:Temperature; D013997:Time Factors
chemical_list: D003470:Culture Media; D000362:Agar