Objective To try diagnosing brucellosis with PCR technology. Methods Backward investigation was taken. Ninety eight whole blood and twenty one serum samples from patients suffering from brucellosis in Shaanxi were collected .Three different ways in which extract DNA and two pairs of primers were used. Each sample was amplified twice and thirty five cycles were performed.Reseults Only two samples were positive, and the other were negative.Conclusions Sensitivity of the current PCR assay was too poor. Th...