White spot disease

F VON FISCHER
1949 Dermatologica  
White spot disease (WSD) is a contagious viral disease of penaeid prawns and is caused by white spot syndrome virus (WSSV), an enveloped, rod-shaped virus containing a double-stranded DNA genome. WSSV is classified as a member of the Whispoviridae. The virus infects a wide range of crustaceans. WSSV was first reported from both Taiwan and the People's Republic of China (PRC) in 1992. Subsequently, it has spread throughout East, Southeast and South Asia, North, South and Central America. In
more » ... al America. In aquaculture, WSD outbreaks are often characterised by high and rapid mortality of infected populations. Acutely affected prawns are lethargic and anorexic, may have a loose cuticle with numerous white spots and may show a pink to red discolouration. Lesions are associated with systemic destruction of the ectodermal and mesodermal tissues, especially the cuticular epithelium and subcuticular connective tissues. In farmed penaeid prawns, mortality can reach 100% within a few days of the onset of clinical signs. A wide range of decapods is susceptible to infection, but morbidity and mortality as a consequence of infection is highly variable. Sub-clinical infections are also known to occur.
pmid:18132360 fatcat:v4r7fi7akrfbxdp3ntboxxmdxm