Abstract
Q fever is a worldwide zoonosis caused by Coxiella burnetii bacterium. Two clinical forms are present: acute Q fever and chronic disease, including endocarditis. Currently, the diagnosis of Q fever endocarditis is based on the detection of anti-phase I antibodies. The objective of the study was to identify candidate proteins for the serological diagnosis of endocarditis due to C. burnetii. The immunoreactivities of sera from 12 patients with C. burnetii infections, including the sera from patients with endocarditis and with the acute clinical form of Q fever, were compared with those of three control subjects who did not have Q fever. We identified 29 candidate antigenic proteins by mass spectrometry. Two proteins, arginine repressor and OmpH, were recognised exclusively by the sera of patients with Q fever endocarditis. These proteins are promising candidates for the development of serodiagnostic assays for Q fever endocarditis.
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