Systemic autoimmune disease and concurrent nematode infection in a dog

Area of Science:

• Veterinary Medicine
• Immunology
• Canine Pathology

Background:

• Systemic lupus erythematosus (SLE) is a chronic autoimmune disease affecting multiple organ systems.
• Concurrent infections can exacerbate autoimmune conditions, complicating diagnosis and treatment.
• Nematode infections are common in dogs and can trigger immune responses.

Observation:

• A dog presented with severe clinical signs suggestive of systemic lupus erythematosus, including neurological deficits, polyarthritis, and weight loss.
• The dog exhibited thrombocytopenia and positive serological markers for lupus erythematosus, rheumatoid factor, and antinuclear antibodies.
• Elevated levels of hypergammaglobulinemia and platelet-associated IgG were noted.

Findings:

• The dog was diagnosed with systemic lupus erythematosus (SLE) and concurrent nematode infections (hookworm, whipworm, heartworm).
• Initial treatment with corticosteroids and antiparasitic drugs resulted in clinical improvement.
• Subsequent administration of cyclophosphamide was required for immunosuppression, and IgE autoantibodies were suspected.

Implications:

• Concurrent infections can significantly worsen the prognosis of canine systemic lupus erythematosus.
• Effective management requires addressing both autoimmune disease and underlying parasitic infections.
• This case highlights the complex interplay between infection and autoimmunity in veterinary medicine.