A method is described for the serotyping of Cryptococcus neoformans ba
sed on direct analysis of culture supernatants for the major type-spec
ific capsular antigen, glucuronoxylomannan. Factor sera prepared by ab
sorption of polyclonal rabbit antisera (Iatron Laboratories, Inc., Tok
yo, Japan) or selected anti-C. neoformans monoclonal antibodies were u
sed in a dot enzyme assay to detect the presence of antigen.