What percentage of cows testing positive for bovine leukemia virus are likely to develop clinical signs?

Cows that test positive for the bovine leukemia virus (BLV) often exhibit a range of clinical outcomes, with many remaining asymptomatic for a long time. Research indicates that only a small percentage of these infected cows, typically in the range of 0-5%, will actually go on to develop clinical signs of disease associated with BLV. The low percentage reflects the chronic nature of the infection, where many cattle can harbor the virus without showing overt symptoms or signs of illness for years. This emphasizes the importance of monitoring and managing the herd for disease prevention, as well as understanding that a positive test for BLV does not necessarily indicate an imminent health crisis in the majority of cases. Therefore, the correct answer accurately reflects the epidemiological data surrounding BLV infections and their clinical manifestations in cattle.