Potent Psittacosis Antigens Free of Anticomplementary Activity

Abstract
A method for the preparation of psittacosis antigen is presented. Antigenic potency is unusually high in some preparations. When lyophilized, the antigen is completely free of anticomplementary activity, stable for the 4-month period tested, apparently more sensitive than a lympho-granuloma venereum antigen in the detection of psittacosis antibodies, and apparently free of nonspecific properties.