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Antibodies to Cryptosporidium sp. were detected in sera from 12 immunocompetent individuals recovered from cryptosporidiosis and from 5 subjects with an acquired immunodeficiency syndrome and persistent cryptosporidiosis by an indirect immunofluorescent (IIF) test. Marked seroconversion accompanied recovery from infection in immunocompetent individuals, and their IIF titers remained high (1:40 to 1:640) for at least 1 year. No antibodies to Cryptosporidium sp. were detected in sera from two subjects with hypogammaglobulinemia, normal T-cell function, and persistent cryptosporidiosis or in sera from individuals not previously exposed to Cryptosporidium sp. Very little or no cross-reactivity with the other coccidia--Toxoplasma, Sarcocystis, and Isospora spp.--occurred in the IIF test procedure. The application of this IIF procedure, along with recently developed techniques to detect oocysts in the feces, should provide the basis for a more accurate assessment of the number of individuals within any subject group with previous and active Cryptosporidium infections.

Demonstration of serum antibodies to Cryptosporidium sp. in normal and immunodeficient humans with confirmed infections