Katavac Eclipse Dosage and administration The vaccination of female cats prior to mating is recommended to provide maternally derived antibody for the kittens. The vaccine is to be administered subcutaneously to cats of 9 weeks of age or older. Aseptically reconstitute the contents of the Katavac CHP freeze-dried vial using Fevaxyn FeLV as a diluent. Vaccination Schedule Primary vaccination: A single dose of Katavac Eclipse should be administered from 9 weeks of age followed by a second injection after an interval of 3-4 weeks. Booster vaccination: Booster vaccinations are recommended every 12 months.