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Spherusol ® is a skin test antigen indicated for the detection of delayed-type hypersensitivity to Coccidioides immitis in individuals with a history of pulmonary coccidioidomycosis. Spherusol ® is approved for use in individuals 18-64 years of age.
Spherusol ® is a sterile aqueous solution of extracts of C. immitis spherules. The multi-dose vial contains 0.9% sodium chloride and 0.014% sodium borate with 0.4% phenol as a preservative. Residual thimerosal from the manufacturing process is present at a concentration of ≤0.0001% (<0.05 mcg mercury/0.1 mL dose). Each 0.1 mL dose contains 1.27 mcg of spherule-derived antigen.
The potency of each lot of Spherusol ® is determined in sensitized guinea pigs.