Authors: Curtiss Jeffrey B, Lewis Michelle, Mitchell Emily P
Journal: Veterinary pathology
Summary
# Editorial Summary: Pemphigus Foliaceus in Arabian Oryx Between 2003 and 2016, six Arabian oryx at a South African zoo presented with progressive, bilaterally symmetrical hyperkeratotic skin lesions and pustules predominantly affecting the pinnae, face, nasal planum, distal limbs, and tail tip—clinical and histopathological findings consistent with pemphigus foliaceus (PF), an autoimmune acantholytic condition previously documented across multiple mammalian species including horses. Despite thorough investigation encompassing histology, medical record analysis, dietary and environmental assessment, and special staining for infectious agents, no consistent inciting cause could be identified in any affected individual. The authors propose that the Arabian oryx's recent survival through severe genetic bottlenecking, combined with the physiological stress of maintaining captive populations adapted to arid desert environments, may have predisposed these animals to autoimmune disease expression. Whilst this case series involves non-equine species, it highlights an important consideration for practitioners: autoimmune skin disease can emerge in genetically restricted or stressed populations without obvious environmental or nutritional triggers, suggesting that genetic susceptibility and systemic stress factors warrant equal clinical attention to dietary or infectious causes when investigating recurrent acantholytic conditions in horses.
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Practical Takeaways
- •Pemphigus foliaceus is an autoimmune condition that can affect multiple species including equines; diagnosis requires histopathology and exclusion of infectious causes
- •Bilaterally symmetrical hyperkeratotic lesions on face, ears, legs and tail with pustules should prompt consideration of autoimmune acantholytic disease
- •Population genetics and extreme environmental adaptation may predispose certain species to autoimmune diseases even without identifiable environmental or infectious triggers
Key Findings
- •Six Arabian oryx developed progressive bilaterally symmetrical hyperkeratotic skin lesions and pustules consistent with pemphigus foliaceus from 2003-2016
- •Lesions primarily affected pinnae, face, nasal planum, distal legs, and tail tip
- •Histological evaluation and special stains revealed no consistent infectious organism or identifiable inciting cause
- •Genetic bottleneck and adaptation to arid desert environments may have contributed to autoimmune disease development in this species