Beginning in October 2007, fresh frozen shrimp products for human consumption imported into Australia were subjected to mandatory testing using PCR technology for 3 major shrimp viruses — white spot syndrome virus (WSSV), yellow head virus (YHV) and infectious hypodermal and haematpoietic necrosis virus (IHHNV) (now called Penaeus stylirostris densovirus or PstDNV) at the level of 5% prevalence with 95% confidence. Batches that tested positive had to be destroyed or cooked in an approved facility . The requirement for IHHNV testing was dropped on 12 September 2008, but testing requirements for YHV and WSSV remain unchanged. Similar testing requirements are not applied for viruses in other fresh frozen crustaceans, fish or mollusks.