Feline leukemia virus in a captive bobcat

Area of Science:

• Veterinary Pathology
• Virology
• Wildlife Health

Background:

• Feline leukemia virus (FeLV) is a retrovirus that affects domestic cats.
• Reports of FeLV in nondomestic felids are rare, with limited evidence of endemicity in wild populations.

Observation:

• An 11-month-old bobcat presented with severe clinical signs including lethargy, anorexia, and significant blood count abnormalities.
• Diagnostic tests confirmed FeLV positivity, and post-mortem examination revealed widespread organ damage consistent with viral infection.

Findings:

• FeLV was isolated from multiple tissues, and viral genetic sequences were identified.
• The bobcat's infection was potentially linked to a domestic cat surrogate nurse, suggesting a route of transmission.
• Pathological findings included encephalitis, pneumonia, hepatocellular necrosis, peritonitis, and lymphoid depletion.

Implications:

• This case underscores the potential threat of FeLV to nondomestic felid populations, both captive and wild.
• Introduction of FeLV could have severe health and survival consequences for vulnerable felid species.
• Implementing biosecurity measures to prevent FeLV introduction into nondomestic felid populations is crucial.