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In order to investigate serum antibodies for detection of brucellosis in pigs, a total of 1208 sera were tested by Rose Bengal test (RBT), the standard tube agglutination test (STAT) and competitive ELISA (cELISA). The sera were collected from pigs of Gyeonggi, Chungnam, Chungbuk, Jeonnam and Jeonbuk,provinces during the period 2002 to 2004. All the sera were screened by RBT, and were confirmed by STAT and cELISA. Among 1208 sera, 26 sera (2.2%) were positive in screening test. All the 26 positive sera were positive by STAT, while all the sera were negative by cELISA. On the basis of this study,farmed pigs may be exposed to Brucella species. Furthermore, these results suggest that establishment of diagnoses for detection of porcine brucellosis is necessary.