Background Brucellosis is a zoonsis and causes abortion in farm animals. The disease is prevalent in many parts of Iran and is responsible for economic losses. Detection and control of the disease in animals have economic benefits and also will control malt fever in human. Material and Methods In a survey, 30 samples of aborted lamb fetuses were tested in microbiology Department, School of Veterinary Medicine. Samples were taken from abomasums and cultured an Blood agar and Mac Conkey agar. Blood agar cultures was placed in an anaerobic jar containing CO2, and then, both cultures were incubated for 48h at 37 º C. The grown bacteria were tested microscopically and macroscopically. Gram stain, Catalase, Oxidase, TSI and Urease tests were conducted. Also the bacteria were cultured an plates containing tuonin and fusion. Results: Of 30 samples, 3, 1 and 12 samples were detected as Brucella. melitensis (%10), Brucella. abortus (%3/3) and E .coli (%40) respectively. 14 samples were found to be negative. B. melitensis and B. abortus were observed to be the main pathogen. E .coli, an opportunist bacteria causes septicemia in aborted fetuses. Discussion: B. melitensis and B. abortus cause abortion in sheep as pathogen. Regular testing and intense health care decrease the disease in animals. Vaccination is one of the best ways to control this disease in animals and thereafter in human.

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