This paper describes a rapid procedure for diagnosis of penaeid viral disease using the immune serological method. The SPA (Staphylococcal Protein A) coagglutination test in early diagnosis of penaeid viral disease has yielded satisfactory results. This is the first time SPA is used in China for diagnoses of viral diseases of marine invertebrates

especially penaeid shrimp. The SPA early diagnostic method is characterized by accuracy

rapidity

simplicity and convenience

low cost

high specificity

strong sensitivity and micro-detectability

and easy dissemination and adaptability in prawn farms.