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Infectious Myonecrosis Virus (IMNV)

Unassigned sp. from Family Totiviridae. Virions measure ~40nm non-enveloped icosahedral virion, dsRNA. Affected countries: Almost entirely in Brazil, limited information in Asia but was reported in Indonesia and China in 2006

IMNV causes mass mortalities, low survival rates 30-40%. IMNV can infect Litopenaeus vannamei late PL, juveniles and subadults, experimentally infected L.stylirostsis and P. monodon. Gross symptoms - White foci in muscle, progressive necrosis of tail fan, tail looks reddened (cooked) in appearance. Poor feed conversion ratios. Animals feed until capture, stress of capture causes tail whitening very quickly

Focal acute muscle necrosis with oedema, haemocytic inflammation and fibrosis. Enlarged Lymphoid organ with spheroids, spheroids can become ectopic and be found in gills and heart

Univeristy of Arizona

Tucson, Arizona

USA