Abstract
A comparative evaluation was performed on the micro- and macrocomplement fixation (CF) tests that are used as standard procedures in the serodiagnosis of blastomycosis, coccidioidomycosis, and histoplasmosis. Tests with 937 sera from suspected and culturally proven cases of these diseases against yeast-form antigens of Blastomyces dermatitidis and Histoplasma capsulatum and against the soluble antigens, coccidioidin and histoplasmin, revealed that the microtiters were within +/- 1 dilution of the macrotiters in 83 to 93% of the sera. Tests on randomly coded quality control sera revealed the microform of the CF test to be highly reproducible. Our studies indicate that the results obtained by the two tests have similar diagnostic and prognostic interpretations. Because of the sensitivity, reproducibility, economy, and ease of performance, the microtest is highly recommended for use in fungus serology.
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