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Cats can pass it on to each other through bites, grooming, and sharing water and food bowls and litter pans. Blood-sucking insects such as fleas and mosquitoes may transmit FeLV from cat to cat. It is not transmitted via air.
The three forms of feline leukemia are chest, abdominal, and multicentric. The signs that the cat shows depend on the lymph nodes and organs involved.

Chest symptoms include enlarged chest lymph nodes, compressed windpipe and esophagus, fluid accumulation in the chest, breathing difficulties, coughing, and gagging.

In abdominal leukemia, malignant cells may be present in the intestine, lymph nodes, liver, spleen, or kidney. There may be a decrease in appetite, depression, weight loss, dehydration, vomiting, diarrhea or constipation, anemia, and jaundice.

Multicentric leukemia causes greatly enlarged lymph nodes under the skin and tumor formation in many organs. The cat may or may not have a fever.