For the active immunisation of cattle from 1 month of age against Leptospira interrogans serovar hardjo and Leptospira borgpetersenii serovar hardjo. It reduces shedding of Leptospira interrogans serovar hardjo in urine. It improves herd fertility when infertility is diagnosed as caused by Leptospira hardjo. Subcutaneous injection. Zero milk withdrawal. Zero meat withdrawal.