Camelidae and Cervidae Sunburn Study Guide

Overview and Clinical Importance

Sunburn (solar dermatitis or actinic dermatitis) and photosensitization are important integumentary conditions affecting camelids (llamas, alpacas, vicunas, guanacos) and cervids (deer, elk, moose, reindeer). These conditions result from ultraviolet (UV) radiation damage to the skin and are particularly significant in animals with non-pigmented or sparsely haired skin. Understanding the distinction between true sunburn (phototoxicity) and photosensitization is essential for accurate diagnosis and effective treatment.

In both camelids and cervids, these conditions can cause significant welfare concerns, economic losses due to skin damage, and may progress to squamous cell carcinoma with chronic exposure. The NAVLE frequently tests candidates on differentiating primary versus secondary photosensitization and understanding species-specific risk factors and management strategies.

Pathophysiology of UV-Induced Skin Damage

Understanding the UV Spectrum

The solar spectrum reaching the earth's surface consists of approximately 40% visible light (400-700 nm), 50% infrared radiation (700-20,000 nm), and 9% ultraviolet radiation (100-400 nm). For dermatological purposes, UV radiation is divided into three categories with different biological effects.