La leucose bovine est une maladie persistante et incurable qui affecte la santé, la productivité et la rentabilité des fermes laitières. 

When an antibiotic is administered, susceptible bacteria may be eliminated, allowing resistant bacteria to thrive and become dominant. This can make the antibiotic ineffective for future treatments and can therefore increase the risk of infections persisting in the afflicted animal and spreading to other animals in the herd, or to humans.