 alter immunolog activ sarcoidosi studi 16 patient sarcoidosi reveal evid immunolog alter impair delai hypersensit transient impair respons lymphocyt cultur patient sarcoidosi phytohemagglutinin stimul parallel clinic sever diseas hemolyt activ serum complement increas disproportion increas serum iga characterist hyperglobulinemia sarcoidosi observ indic alter immun respons pathogenesi sarcoidosi simpl hypothesi specif kind interact infecti agent immun result immunolog alter observ formul present 