“…In the SVCVinfection group, each fish was intraperitoneally injected with 250e300 mL SVCV at a dosage of approximately 10 7 TCID 50 /kg body weight, while fish in the control group were injected with the same amount of saline. At 5 days post-infection, RT-PCR and nested PCR reactions [23] in spleen and head kidney tissues confirmed that the experimental carp were infected by SVCV (Figure not Total RNAs were all extracted from sperm, eggs, the embryos and larvae at different developmental stages of carp, and the various tissues (gill, spleen, thymus, head kidney, kidney, liver, muscle, skin, brain, peripheral blood and intestine) of carp (the GHtransgenic carp, the infected carp at different time points and control carp) using Trizol Reagent (Invitrogen) following the user's manual. The quality and concentration of total RNA were analyzed by agarose gel electrophoresis and optical density reading at 260 and 280 nm.…”