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The efficacy of monoclonal antibody (MAb 2H1) against diverse strains of Cryptococcus neoformans was studied in a murine model of intravenous infection. For six of eight strains, administration of MAb prior to infection prolonged survival of mice. For two strains, 371 and SB4A, administration of MAb prior to infection did not prolong survival in multiple experiments with inocula ranging from 10(2) to 10(6) yeast cells per mouse. Mice infected with strains 371 and SB4A had fewer CFU than non-MAb-treated controls, but the CFU reduction was not sufficient to affect survival. Serum glucuronoxylomannan (GXM) levels varied for the different C. neoformans strains. For mice that did not receive MAb 2H1, there was a positive correlation between lung fungal burden and serum GXM levels. MAb 2H1-treated mice had significantly reduced serum GXM levels. The results indicate that the efficacy of MAb 2H1 administration in prolonging survival and/or reducing organ CFU varies with the C. neoformans strain.

Variable efficacy of passive antibody administration against diverse Cryptococcus neoformans strains