A suspension for injection containing per 2 ml dose inactivated Leptospira borgpetersenii serovar Hardjo type hardjobovis vaccine containing (≥ 2RP*), the adjuvant aluminium hydroxide (3.0 to 3.6 mg aluminium), and the excipients formaldehyde (<1 mg) and thiomersal (max. 0.01 %w/v). *RP = ELISA Relative Potency