Use of D-proline assimilation and CGB medium for screening Brazilian Cryptococcus neoformans isolates.

D-proline assimilation and CGB tests were performed on 233 Cryptococcus neoformans isolates from Brazil. The results disclosed a high sensitivity, D-proline 99-13% and CGB 99.57%, for screening of the varieties. D-proline assimilation test revealed two false negative results for 5.1% of 39 strains of var. gattii, and no false positive results were observed in 194 strains of var. neoformans. No false results and only one doubtful result were found on the CGB medium.