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In cultured shrimp, w h ~ t e spot syndrome 'baculovirus' (WSBV) Infection IS characterized by a wide range of target tissues, rapid disease onset and high mortality Dunng the viremic phase of infection, the virus is present in many organs However, the s~tuat ion in the natural environment remalns unclear To identify the pattern of the t ~ s s u e t rop~sm of WSBV infection in adult Penaeus monodon (black tiger shnmp) of wild ongin, we conducted a comb~ned study using currently available nucleic acid diagnostic tools and conventional histological observat~ons uslng light (LM) and transnxssion electron (TEM) mlcroscopy to examine the sites for virus mult~plication S ~ x t e e n parts excised from shnmp specimens were examined pleopods, gills, stomach, abdominal muscle, hemolymph. m ~ d g u t , heart, pereiopods lymphoid organs, integument, nervous tissue, hepatopancreas, testes, ovaries, spermatophores, and eye stalks All these tissues/organs were found to support WSBV replic a t ~ o n For the f~ r s t ~ m e in s ~ t u hybridization and TEM showed evidence of WSBV in reproduct~ve organs of black tiger shrlmp In testes, WSBV-positive cells were located in the connective Ussue layer surrounding the seminiferous tubules and no germ cells were found to be infected In the spermatophore only muscle and connective t~s sue cells were WSBV posltive In the ovary, foll~cle cells oogonla oocytes and connective tissue cells were WSBV positlve However, the fact that w e were unable to find any Infected mature eggs suggested that infected egg cells were killed by the virus before maturation

diseases of aquatic organisms

Detection and tissue tropism of white spot syndrome baculovirus (WSBV) in captured brooders of Penaeus monodon with a special emphasis on reproductive organs