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在患暴发性流行病病虾肝胰腺及中肠超薄切片中看到有包膜的杆状病毒颗粒，长２５０～２７０ｎｍ、宽７０ｎｍ左右。将除菌病虾组织浆悬液注射健康虾，可引起发病死亡，症状与自然发病虾相仿。因此，杆状病毒是中国对虾暴发性流行病的病原。同时在活检时发现病虾肝胰腺及心脏压片中有较多细菌，将未除菌病虾组织浆悬液注射健康虾，比注射除菌病虾组织浆悬液的虾死亡早而迅速，所以受病毒感染后再继发细菌感染将加快病情恶化和死亡。经投喂病虾肝胰腺及用除菌病虾组织浆悬液浸泡健康虾，均可引起对虾发病死亡，所以我们初步认为该病毒是通过口及接触而感染。
Encapsulated baculovirus particles are seen in the ultra-thin sections of hepatopancreas and mid-gut of diseased pandemic disease shrimp, about 250-270 nm in length and about 70 nm in width. The diseased shrimp tissue slurry suspension injection of healthy shrimp, can cause morbidity and mortality, symptoms similar to the natural disease shrimp. Therefore, baculovirus is the causative agent of the epidemic of shrimp in China. In the meantime, more bacteria were found in the hepatopancreas and heart tablet of diseased shrimp during biopsy, and the healthy shrimp were injected with tissue suspension of diseased shrimp without early removal of swine shrimp, So by the virus infection and then secondary bacterial infection will exacerbate the deterioration and death. After the feeding of diseased shrimp hepatopancreas and diseased shrimp tissue suspension of soaked healthy shrimp, can cause the death of shrimp, so we initially believe that the virus is infected through the mouth and contact.