title: Exoantigen tests for the rapid and specific identification of Apophysomyces elegans and Saksenaea vasiformis.
abstract: Apophysomyces elegans and Saksenaea vasiformis frequently fail to sporulate on routine media used in clinical laboratories, thus delaying or preventing their specific identification. We have developed exoantigen test reagents capable of identifying non-sporulating isolates of A. elegans and S. vasiformis. A reagent containing three specific A. elegans precipitins was produced when A. elegans antiserum was absorbed with S. vasiformis. Antigenic analyses showed that at least two serotypes of S. vasiformis exist. Only six of 10 S. vasiformis isolates studied produced bands of identity with S. vasiformis (B-2190) (serotype 1) antiserum absorbed with S. vasiformis (B-2189) (serotype 2) antigens. The remaining four isolates, however, produced bands of identity with S. vasiformis B-2189 antiserum absorbed with B-2190 antigens. Antigenic differences among the isolates of the two groups could be correlated to some extent with the morphologic differences observed, especially with respect to the size of the sporangia and sporangiospores.
authors.affiliation: Division of Mycotic Diseases, Centers for Disease Control, Atlanta, Georgia 30333.
authors.forename: G
authors.initials: G
authors.lastname: Lombardi
authors.forename: A A
authors.initials: AA
authors.lastname: Padhye
authors.forename: P G
authors.initials: PG
authors.lastname: Standard
authors.forename: L
authors.initials: L
authors.lastname: Kaufman
authors.forename: L
authors.initials: L
authors.lastname: Ajello
mesh_terms: D000940:Antigenic Variation; D000946:Antigens, Fungal / Q000032:analysis*; D007106:Immune Sera / Q000276:immunology; D005779:Immunodiffusion; D009090:Mucorales / Q000276:immunology / Q000302:isolation & purification* / Q000502:physiology; D013172:Spores, Fungal
chemical_list: D000946:Antigens, Fungal; D007106:Immune Sera