Feline leukemia virus and feline immunodeficiency virus are distinct, contagious, incurable viruses that cause similar clinical signs and are more likely to affect cats that spend time outdoors. Cats with either FeLV or FIV can live relatively normal lives, but they should be housed indoors alone or only with other infected cats to prevent transmission, says veterinarian Jennifer Reinhart.
FeLV, FIV are incurable, but not automatic death sentences for cats
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