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. 1984 Mar;43(3):860–869. doi: 10.1128/iai.43.3.860-869.1984

Reactivity to spherule-derived coccidioidin in the southeastern United States.

W W Woodruff 3rd, C E Buckley 3rd, H A Gallis, J R Cohn, R W Wheat
PMCID: PMC264262  PMID: 6199305

Abstract

Delayed hypersensitivity skin tests with mycelium-derived (coccidioidin) or spherule-derived (spherulin) antigens (or both) can be used to identify patients who have been sensitized to the dimorphic fungus Coccidioides immitis. Prior studies suggest that coccidioidin and spherulin skin test antigens detect comparable numbers of reactors among exposed subjects. Studies in subjects residing in areas outside the United States where C. immitis is not endemic suggest that both antigens are specific for the fungus. The specificity and reactivity of coccidioidin and spherulin have not been compared in nonendemic regions of the United States in which the skin test antigens and an appropriate travel or exposure history are used to identify patients with possible C. immitis infection. A review of delayed cutaneous reactions to coccidioidin in 6,375 patients tested between 1970 and 1979 in the southeastern United States revealed 958 (15.0%) and 234 (5.7%) positive reactions (greater than or equal to 5 mm), respectively, at 24 and 48 h. Subsequent tests with spherulin in 2,775 patients tested in 1980 and 1981 revealed 866 (31.2%) and 288 (10.3%) positive reactions, respectively, at 24 and 48 h. False-positive immediate hypersensitivity reactions contributed to the large number of spherulin reactors at 24 h. Differences among the patients sampled, work exposure, and travel history were excluded as causes of this surprising and highly significant (P less than or equal to 0.0001) difference in the 48-h delayed cutaneous reaction. These observations suggest two possibilities: (i) spherulin is less specific than coccidioidin, or (ii) a surprising prevalence of C. immitis sensitization exists among patients in nonendemic regions of the United States.

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Selected References

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