In summer of 2014,sustained death occured in parent shrimp of Litopenaeus vanname in Guangxi. The hepatopancreas of infected shrimps turned atrophic,the muscles of uromere turned whitish,and the gill turned yellow. The bacteria were isolated from the infected shrimps and the pond water by TCBS. The 16 SrRNA were amplified,sequenced and analyzed by DNAStar. Then,the hepatopancreas,gill filaments,muscles and guts were researched on histopathological changes. The results showed that five strains isolated from ...