Abstract
Sera from patients with trachoma, psittacosis and lymphogranuloma venereum were tested in the complement fixation test with both “purified” elementary body antigens and boiled phenolized group antigens made with each of the 3 viruses. Group antigen prepared with trachoma virus reacted similarly to group antigens made with psittacosis and lymphogranuloma venereum viruses. The trachoma elementary body antigen reacted only with sera from trachoma patients. Psittacosis and lymphogranuloma venereum elementary body antigens failed to react with trachoma serum but did react about equally with sera from both psittacosis and lymphogranuloma venereum patients. It is concluded that trachoma virus contains the group antigen of the P-LV group and in addition a specific antigen which permits its serologic differentiation from the agents of psittacosis and lymphogranuloma venereum.
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