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  • Title: Comparative efficacy of three commercial feline leukemia virus vaccines against methylprednisolone acetate-augmented oronasal challenge exposure with virulent virus.
    Author: Pedersen NC, Johnson L.
    Journal: J Am Vet Med Assoc; 1991 Nov 15; 199(10):1453-5. PubMed ID: 1666102.
    Abstract:
    Three commercial FeLV vaccines, (A, B, and C) were purchased on the open market and administered to 8- to 20-week-old specific-pathogen-free kittens, according to manufacturers' instructions. A similar group of nonvaccinated kittens served as controls. All kittens were challenge-exposed oronasally with virulent FeLV 4 weeks after the final vaccination. Serum samples were monitored for FeLV-p27 antigenemia using an ELISA at 1- to 2-week intervals for at least 16 weeks after the last day of challenge exposure. Kittens that were either transiently (1 to 4 weeks) or never viremic during this period were counted as recovered, whereas kittens that became viremic and retained viremia for at least 10 weeks were counted as persistently viremic. The 3 vaccines were found to be 39% (vaccine C), 28% (vaccine B), and 17% (vaccine A) efficacious in preventing persistent viremia in immunized, compared with nonimmunized kittens.
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