Objective To study the characteristics of neutralization antibody in mice induced by DNA vaccines of hemagglutinin(HA) of novel H1N1 influenza A virus(2009H1N1).Methods HA encoding plasmids of 2009H1N1 or 1918H1N1(2009HA or 1918HA)were constructed.25 μg or 200 μg dosage of 2009HA plasmids were used to immunize the mice,the total antibody of anti-20O9HA or cross-reactive antibody were assayed by ELISA using 2009HA or 1918HA protein as capture antigen,and the neutralizing antibody were assayed by two kinds of virus pseudo - particles(pp) of 2009H1N1 and 1918H1N1 .Results During of 4 to 16 weeks after boost immunization,in two groups of mice immunized with 25 μg or 200 μg dosage 2009HA plasmids,both total antibody of anti-2009HA and neutralizing antibody to 2009H1Nlpp reached the similar level(P ＞0.05),and there were cross-reactive antibody to 1918HA protein in two groups of mice serum,with similar titers of cross-neutralizing activity to 1918H1N1 pp(P ＞0.05),Conclusion A low dosage DNA vaccine encoding HA of 2009 H1 N1 virus is able to induce persistent and high level of neutralizing antibody,and may be potential valuable vaccine against the new emerging influenza virus.

Objective To investigate the efficacy and safety of primary suture after laparoscopic choledochotomy in the treatment of elderly patients with extrahepatic bile duct stones. Methods A total of 148 elderly patients with extrahepatic bile duct stones were enrolled in this study. All patients underwent laparoscopic choledochotomy, among whom 88 received primary suture (primary suture group) and 60 underwent routine T-tube drainage (routine group). Surgical-related indicators, changes in inflammatory factor levels, recovery of postoperative gastrointestinal function and incidence of complications were compared between the two groups. Results The operative time, postoperative drainage time, hospital stay, first exhaust time and bowel sound recovery time were significantly shorter in the primary suture group than in the routine group (P < 0.05). No statistically significant differences were observed in intraoperative blood loss and overall treatment efficacy between the two groups (P>0.05). Compared with preoperative levels, the levels of C-reactive protein (CRP), tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), alanine aminotransferase (ALT), aspartate aminotransferase (AST) and total bilirubin (TBIL) increased initially and then decreased in both groups after surgery, with statistically significant differences at different time points (P < 0.05). The serum levels of CRP, TNF-α and IL-1β in the primary suture group were significantly lower than those in the routine group at 1 and 2 days after operation (P < 0.05). The total incidence of postoperative complications was 3.41% in the primary suture group, which was significantly lower than the 11.67% in the routine group (P < 0.05). No statistically significant difference was observed in the incidence of common bile duct stenosis within 3 months after surgery between the two groups (P>0.05). Conclusion Primary suture after LCBDE exhibits favorable efficacy in the treatment of elderly patients with extrahepatic bile duct stones, which contributes to shorten operative time, relieve inflammatory response, reduce incidence of postoperative complications, and high safety.