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Lyophilized antigen for the diagnosis of bovine leukosis in immunodiffusion test was extracted from FLK cells which had been infected with bovine leukemia virus. When the antigen was stored at 4°C, -20°C and -40°C for 15 months, its snsitivity and specifivity remained unchanged.
Serological survey of serum sample obtained from milk goat in 14 geographical regions of Taiwan, 120 out of 7,855 were positive. The positive rates varied from 0% to 11.5% in diffferent geographical regions with an average of 1.5%. The positive rates of 11.5% and 11 % were the highest in the positive regions while those of the seven regions were very low. Another five regions gave a negative reaction.
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