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  • Title: [Vaccination of cats against infection with feline leukemia virus (FeLV): first recombinant vaccine and the effect of a pre-existing infection with feline immunodeficiency virus (FIV)].
    Author: Hofmann-Lehmann R, Aubert A, Wolfensberger C, Cronier J, Lutz H.
    Journal: Schweiz Arch Tierheilkd; 1994; 136(10):340-51. PubMed ID: 7801087.
    Abstract:
    A new recombinant FeLV vaccine was evaluated in 30 specified pathogen-free cats 10 months of age cats. The vaccine consisted of the non-glycosylated FeLV envelope protein p45, aluminium hydroxide and a saponin adjuvant. The cats (n = 18) were vaccinated twice intramuscularly, 3 weeks apart. All animals were challenged intraperitoneally with FeLV subgroup A, 18 weeks later. While 94% of the vaccinated cats showed no viraemia or were only transiently viraemic, 80% of the non-vaccinated animals became persistently viraemic within 2 to 3 weeks. In our hands the preventable fraction of the vaccine was 93%. In order to determine the effect of a pre-existing infection with feline immunodeficiency virus on the efficacy of vaccination, 50% of the cats were previously infected with FIV. The infected cats were protected to the same degree as the non-infected animals. With prolonged duration of FIV infection the probability increases, that the immune system of the cat will fail and clinical signs will appear. In order to observe a state of possible immunodeficiency, an accurate clinical examination of every cat prior to vaccination seems of major importance.
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