| epidemiological study of bovine brucellosis in three agro-ecological areas of central oromiya, ethiopia. | a cross-sectional sero-epidemiological study of bovine brucellosis was conducted between september 2005 and march 2006 in three separate agroecological areas of central oromiya, ethiopia. in this study, a total of 176 clusters (farms) and 1,238 animals were selected, using the one-stage cluster sampling method. fifty-nine clusters and 423 animals were selected from the lowland areas; 58 clusters and 385 animals from the midland areas and 59 clusters and 430 animals from the highlands. serum samp ... | 2009 | 20462151 |