Aquatics Lymphocystis Study Guide
Overview and Clinical Importance
Lymphocystis disease (LCD) is a chronic viral disease of freshwater and marine teleost fish caused by Lymphocystis disease virus (LCDV), a member of the family Iridoviridae, genus Lymphocystivirus. The disease is characterized by distinctive wart-like or cauliflower-like nodules on the skin, fins, and occasionally gills. While generally self-limiting and non-fatal, LCD has significant economic implications in aquaculture due to reduced marketability.
LCD affects over 125 different fish species from 34 different families worldwide. Importantly, it does NOT affect cyprinids (goldfish, koi, barbs), catfish, or salmonids - a critical diagnostic consideration.
Etiology and Viral Classification
Causative Agent
Lymphocystis disease is caused by Lymphocystis disease virus (LCDV), a large, icosahedral, double-stranded DNA virus:
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