/b/veterinary-news/posts/virbac-39-s-felv-vaccines-now-give-3-years-immunity Virbac has announced that the European Medicines Agency has granted a 3 year duration of immunity for the feline leukaemia component of both Leucogen and Leucofeligen vaccines, when given after the primary course and first annual booster. Leucogenen-USTelligent Community 10