This article is from the Feline Leukemia (Cats) FAQ, posted to rec.pets.cats newsgroup. Maintained by Erin Miller with numerous contributions by others.
FeLV is transmitted via saliva, mucus, urine, feces and blood. This means mutual grooming and biting/fighting are the most likely methods of transmission, although sneezing, hissing, sharing food/water bowls and sharing litter boxes are also possible means of transmission.
 
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