Otitis externa caused by fungi (otomycosis) occurs more commonly in tropical areas with high moisture than in temperate regions. Bilateral otomycosis is, however, rarely reported. In a case of bilateral otitis externa in a 56-year-old male patient in Taiwan, direct microscopic examination of the cerumen as well as isolation of strains indicated the presence of two Aspergillus species being different in each of both ears. The species were identified by DNA sequence comparisons and additional morphological confirmation of diagnostic characteristics as Aspergillus flavus and Aspergillus terreus. The rarely reported occurrence of two Aspergillus species in otitis of the same patient deserves attention in other cases of otomycosis, particularly with respect to potentially different resistances of different species against antifungals. Treatment with nystatin/neomycin was not successful, but with clotrimazole was effective.
Keywords: Beta-tubulin gene; Eurotiales; Hyphomycetes; Internal transcribed spacer (ITS); Molds.
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