Chlamydial endocarditis has been infrequently reported. A case of blood-culture—negative endocarditis is described in which there was serological evidence of a Chlamydia psittaci infection. Chlamydiae were also identified in aortic valve vegetations by electron microscopy and immunofluorescent staining. Patients with culture-negative endocarditis should be evaluated for infection with Chlamydia as well as other uncommon pathogens.
Jones RB, Priest JB, Kuo C. Subacute Chlamydial Endocarditis. JAMA. 1982;247(5):655-658. doi:10.1001/jama.1982.03320300059025