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After describing the results of BIV research during the past years experimental data are presented which indicate that BIV does not cause any clinical symptoms after infection and that no correlation exists with the other widely spread retrovirus in the bovine, the bovine leukosis virus (BLV). Since contact obviously did not lead to a horizontal transmission it is suggested that transmission occurs, as in the cat, vertically from dam to offspring. It was also found that a long period of time after infection can elapse before antibodies against BIV can be detected. It is also quite clear that HIV and BIV do not have much in common except that both are lentiviruses. [ABSTRACT FROM AUTHOR]