Coxiella burnetii endocarditis after Q fever vaccination.

Coxiella burnetii is the causative bacterium of Q fever, a vaccine-preventable infection. C. burnetii is an unusual cause of culture-negative endocarditis. Here, we present a case of Q fever native valve endocarditis that developed in a young man despite prior vaccination. Definitive diagnosis was difficult and required C. burnetii-specific PCR testing.