Etiological agents of otomycosis in Nigeria.

A total of 159 suspected cases of otomycosis comprising 101 adults and 58 children, 61 males and 98 females were investigated. Of these, 36 cases were confirmed specifically of mycotic etiology on the basis of microscopic demonstration of fungal structures in epithelial debris/plugs and positive culture. Another 31 cases positive for fungi by culture but negative for direct microscopy were considered of doubtful fungal etiology. The predominant etiological agents in the confirmed cases were Aspergillus niger (13 cases), followed by A. flavus (6), Candida albicans (6) and C. parapsilosis (4). Other species represented were Pseudoallescheria boydii (2), C. guilliermondii (1), Aspergillus sp. (unidentified) (2), and Candida sp. (unidentified) (1). One case was of mixed infection due to A. niger and C. albicans. Fungal cultures from normal healthy ear canals of 46 persons were positive in 17 cases, the predominant fungus being Aspergillus (mainly A. niger).