Infectious myonecrosis is a viral disease caused by infectious myonecrosis virus. It affects Pacific white shrimp Penaeus vannamei, tiger shrimp P. monodon and blue shrimp P. stylirostris. IMN is associated with heavy losses in farmed shrimp of 40-70%. 

Originally reported from Brazil, outbreaks were reported in East Java, Situbondo District in Indonesia in May 2006. In 2009 several other provinces were affected.

With the current spread of the disease there is a high threat of the disease spreading to neighbouring P. vannamei-producing countries. Suspected outbreaks should immediately be reported to the authorities. This information sheet provides more information.