The number (percentage) of genital swabs and serum samples that tested positive in the C. burnetii real-time qPCR and C. burnetii-specific antibody ELISA, respectively, as well as the number (percentage) of whole blood samples testing positive or doubtful in the C. burnetii-specific IFN-γ recall essay for both Q fever positive and negative farms. The gene discussed is IFNG; the disease is Q fever.