title: Biofilm production and antifungal susceptibility of co-cultured Malassezia pachydermatis and Candida parapsilosis isolated from canine seborrheic dermatitis.
abstract: The yeasts Malassezia (M.) pachydermatis and Candida (C.) parapsilosis are often co-isolated in case of canine seborrhea dermatitis (SD) and also are emerging as opportunistic pathogens of immunocompromised human beings. Increased information about how their relationship results in biofilm production and an antifungal response would be useful to inform treatment and control. This study was designed to investigate biofilm production derived from co-culture of M. pachydermatis and C. parapsilosis from dog skin and to determine their in vitro antifungal susceptibility. We demonstrated that regardless of yeast strain or origin all single and dual cultures produced biofilms within 24 hours, and the greatest amount was present after 72 hours. Biofilm production from mixed cultures was greater than for single strains (P < .05). All sessile forms of the single and dual cultures were resistant to the tested antifungals itraconazole and ketoconazole, whereas planktonic forms were susceptible. The study suggests that dual cultures produce stronger biofilms that are likely to enhance persistence in skin lesions in dogs and result in greater resistance to antifungal treatment.
authors: Department of Veterinary Microbiology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330.
authors: K
authors: K
authors: Bumroongthai
authors: Department of Medical Science, National Institute of Medical Science, Bangkok, 11000.
authors: P
authors: P
authors: Chetanachan
authors: Department of Veterinary Microbiology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330.
authors: W
authors: W
authors: Niyomtham
authors: Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Bangkok 10330 Thailand.
authors: C
authors: C
authors: Yurayart
authors: Department of Veterinary Microbiology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330 Nuvee.P@chula.ac.th.
authors: N
authors: N
authors: Prapasarakul
mesh_terms: D000818:Animals; D000935:Antifungal Agents / Q000494:pharmacology*; D018441:Biofilms / Q000187:drug effects* / Q000254:growth & development*; D002175:Candida / Q000187:drug effects* / Q000302:isolation & purification / Q000502:physiology; D012628:Dermatitis, Seborrheic / Q000382:microbiology / Q000662:veterinary*; D004283:Dog Diseases / Q000382:microbiology*; D004285:Dogs; D017964:Itraconazole / Q000494:pharmacology; D007654:Ketoconazole / Q000494:pharmacology; D008290:Malassezia / Q000187:drug effects* / Q000302:isolation & purification / Q000502:physiology; D008826:Microbial Sensitivity Tests; D008855:Microscopy, Electron, Scanning
chemical_list: D000935:Antifungal Agents; D017964:Itraconazole; D007654:Ketoconazole
keywords: Candida parapsilosis; Malassezia pachydermatis; antifungal susceptibility; biofilm production; dogs