[Objective] On the basis of successfully built recombinant lactobacillus L. casei 393 / pen which contains the gene of prawn's antibacterial peptides by lab,to research the effects of anti-infection and immunological enhancement on mice after oral administration. [Method]Randomly divide the KM mices and balb / c mices into three groups: NS group,L. casei 393 group and L. casei 393 / pen group. Oral administration. Weigh weight of mices every 7 days,28 days after,detect the immune organ index and the concent...