For the active immunisation of healthy unexposed cats from eight weeks of age against feline leukaemia for the prevention of persistent viraemia and clinical signs of the related disease. Onset of immunity is three weeks after primary vaccination. The duration of immunity is one year after the primary vaccination. Following a first booster vaccination one year after the primary vaccination course, a duration of immunity of 3 years has been demonstrated. Primary course vaccination In cats of eight weeks and over, administer two doses of Leucogen 3 to 4 weeks apart. To protect kittens, the vaccination of female cats prior to mating is recommended. Maternally derived antibodies can negatively influence the immune response to vaccination. In such cases where maternally derived antibodies are expected, a third injection may be appropriate from 15 weeks of age. Revaccination Following a first booster vaccination one year after the primary vaccination course, subsequent vaccination can be performed at intervals of three years.
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