Salmonella is an important zoonosis.China is the largest pork consumer.Contaminated pork is the main source of Salmonella disease at home and abroad.There are many swine Salmonella vaccine in use in Europe.Now the current swine Salmonella vaccine is a live attenuated vaccine,Salmonella can reduce colonization in pigs,and can induce immune response efficiently after the two immunizations.The control effect is poor,at this stage of swine vaccine cross protection research,type of Salmonella and vaccine antigen are not the same.This paper reviews the research progress of swine Salmonella vaccine.

Objective To examine the role of c-Src activation in hepatitis B virus X (HBx) protein induced epithelial-mesenchymal transition (EMT) in liver cancer.Methods SMMC-7721 liver cancer cells were transfected with HBx gene to induce EMT and the activated c-Src expression was evaluated by Western blot.Both the morphological changes and the epithelial and mesenchymal markers expression (real-time PCR,western blot and immunocytochemistry) of HBx-transfected SMMC-7721 cell treated by c-Src kinase inhibitor PP2 and negative control PP3 were observed and compared,respectively.Results The activated c-Src expression in HBx gene transfected SMMC-7721 cells was significantly increased compared to that in mock transfected cells,c-Src kinase inhibitor PP2 could enable the HBx-transfected SMMC-7721 cells to transmit from spindle-like shape to original epithelial morphology.Western blot and immunocytochemistry confirmed that the expression of epithelial markers and mesenchymal markers almost returned to the levels of parental cells,indicating the mesenchymal-epithelial transition.Conclusions c-Src activation plays a key role in the process of EMT induced by HBx protein in SMMC-7721 cells.