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Clinicopathologic criteria were used to group 68 cats according to high, moderate, or low suspicion of having feline leukemia virus (FeL V)-related disease. Peripheral blood samples were tested for FeL V antigen by enzyme-linked immunosorbent assay (ELISA) and for FeL V DNA by polymerase chain reaction (PCR). There was no significant difference between ELISA and PCR results in the 68 cats. In the high-suspicion group, 46% (11/24) of cytopenic cats were test positive (ELISA and PCR) and 87% (13/15) with hemopoietic neoplasms were test-positive. Also within the high suspicion group, test-positive cats were 2.5 times more likely to die within the 1 year follow-up period than were test-negative (ELISA and PCR) cats. Among cats in the moderate-suspicion group, 15% (2/13) were test-positive, and none (0/16) of the cats in the low suspicion group was test positive. The relative risk of a positive test (ELISA and PCR) in the high suspicion group was 3.7 times that for the moderate-suspicion group and 22.8 times that for the low suspicion group. There was no significant difference in the relative risk of a positive test result between the moderate and low suspicion groups. The results indicate that FeL V detection by PCR can be adapted for diagnostic purposes using peripheral blood samples, however, results do not differ significantly from FeL V ELISA results. Also, a proportion of cats with a high suspicion of having FeL V-related cytopenia and hemopoietic tumors are negative for both circulating FeL V antigen and DNA. These cats may not have FeL V-related disease, or FeL V may exist in a disease-producing but nonreplicating form ultimately detectable by PCR in tissues other than peripheral blood.

Feline Leukemia Virus Detection by ELISA and PCR in Peripheral Blood from 68 Cats with High, Moderate, or Low Suspicion of having FeLV-Related Disease