Transgenic grass carp and common grass carp were artificially infected with grass hemorrhage virus.The LD 50 of the former is 10 -2.97 ,the latter is 10 -3.56 ～10 -3.72 when the same doses of 0.2 mL per capita were given.The antiviral ability of the former is 3.89￣5.89 times higher.The lantent period is 1￣2 d longer and the death duration is 1￣2 d shorter than that of the latter.The result suggests that the antiviral ability to carp hemorrhage virus of transgenic grass ...
