VERSICAN Plus L4 (canine leptospirosis vaccine (inactivated)) is used to immunize dogs against leptospirosis, a bacterial disease. Protects against infections caused by Leptospira interrogans serogroups Australis serovar Bratislava, Canicola serovar Canicola, Icterohaemorrhagiae serovar Icterohaemorrhagiae, and Leptospira kirschneri serogroup Grippotyphosa serovar Grippotyphosa.