Purpose Melittin was expressed in prokaryotic vector pGEX-2T for production. Methods Melittin gene synthesized with enterokinase digested sequence,the gene was cloned into vector pGEX-2T,and constructed a recombinant plasmid of pGEX-MEL. Then the recombinant vector was introduced into E. coli BL21 (DE3)for expression. Fusion protein was purified by affinity chromatography. Hemolytic activity of Melittin was detected. Results Analysis result showed that the expression products accumulate in the cells to about 29.5 % of total cell protein. Detection of western blot using ant-GST as the first antibody showed that a special blot was revealed among the expression products. It certified that we have succeeded in expressing the fusion protein. SDS-PAGE showed that most part of the products is resoluble. The purity of obtained protein is 95% , by through GST affinity chromatography system. Melittin is harvested with a recovery of 80% by EK digestion. Test results showed melittin has good hemolytic activity. Conclusion We have expressed Melittin successfully by prokaryotic expression system.

The repair of bone defects poses a great challenge for reconstructive surgeons. Although the development of tissue engineering has exhibited promise in replacing damaged bone, the fabrication of large constructs with functional blood vessels remains an obstacle. From the orthopedic surgeon's point of view, the generation of axially vascularized bone, which can anastomose with the recipient vessel, might be a solution to this medical problem. In this study, we aimed to prefabricate an axially vascularized bone by combining a β-TCP scaffold, arteriovenous loop (AVL), and cell sheet in a bioreactor in vivo. Twelve rabbits were randomly allocated into two groups: the experimental group (presence of AVL) and the control group (absence of AVL). The constructs were explanted at 8 weeks postoperatively. The histomorphometric results showed 42.8±5.9% of the bone area in the AVL group and 26.6±3.5% in the control group. Similarly, vessel analysis revealed the average vessel density in the AVL group (12.5±3.3) was significantly more than that in the control group (6.1±1.5, p<0.05). Our research indicated that the combination of a β-TCP scaffold, AVL and cell sheet might engineer vascularized bone. This prefabrication strategy might facilitate clinical translation of bone tissue engineering in reconstructing large bone defects.
Bioreactors ; Blood Vessels ; Bone and Bones ; Orthopedics ; Rabbits ; Surgeons ; Tissue Engineering

We analyzed the influenza surveillance data of Children′s Hospital of Suzhou University from 2016 to 2018 and estimated the hospitalization burden of children under 5 years old due to influenza infection in Suzhou. The results showed that the influenza virus positive rate of 1 451 severe acute respiratory infection (SARI) cases in Children′s Hospital of Suzhou University was 13.6% (95%CI :11.8%?15.3%;197 cases), among which the influenza pandemic intensity in 2017?2018 was relatively high, and A/H1N1 was the main pandemic virus. It was estimated that the hospitalization rate of influenza?related SARI in children under 5 years old in Suzhou was 6.9‰ (95%CI : 6.6‰?7.2‰), among which the hospitalization rate of children aged<6 months was higher, up to 11.4‰(95%CI: 9.9‰?12.8‰).

We analyzed the influenza surveillance data of Children′s Hospital of Suzhou University from 2016 to 2018 and estimated the hospitalization burden of children under 5 years old due to influenza infection in Suzhou. The results showed that the influenza virus positive rate of 1 451 severe acute respiratory infection (SARI) cases in Children′s Hospital of Suzhou University was 13.6% (95%CI :11.8%?15.3%;197 cases), among which the influenza pandemic intensity in 2017?2018 was relatively high, and A/H1N1 was the main pandemic virus. It was estimated that the hospitalization rate of influenza?related SARI in children under 5 years old in Suzhou was 6.9‰ (95%CI : 6.6‰?7.2‰), among which the hospitalization rate of children aged<6 months was higher, up to 11.4‰(95%CI: 9.9‰?12.8‰).

Objective:To study the influencing factors of influenza-associated severe acute respiratory illness (SARI) in children younger than 5 years of old in Suzhou, and to provide evidence to support the improvement of prevention and control strategies for influenza in children.Methods:We conducted a prospective influenza surveillance for hospitalized SARI and outpatient influenza-like illness (ILI) at Children′s Hospital of Soochow University from April 2011 to March 2017. We compared the clinical and other characteristics of influenza-positive patients with SARI to those with ILI to find the differences and to identify influencing factors of influenza-associated SARI, using χ2 test and unconditional logistic regression. Results:We found 786 cases of influenza-associated ILI and 413 cases of influenza-associated SARI during the study period. Cough, runny nose, shortness of breath, asthma or wheezing were more common in influenza-associated SARI than in influenza-associated ILI ( P<0.01). Univariate and multivariate logistic regression showed that the influencing factors which significantly associated with increased risk of influenza-associated SARI were as follows: younger age (<6 months OR=3.6, 6-23 months a OR=2.5), respiratory infection history within 3 months (a OR=4.5), chronic lung disease history ( OR=3.4), fever above 39.0 ℃ (39.0-39.9 ℃ a OR=2.4, ≥40.0 ℃ a OR=6.0), and the presence of A/H1N1 (a OR=2.3), A/H3N2 (a OR=1.9). Conclusion:Children younger than 2 years old, with a history of chronic lung disease, a history of respiratory infection within 3 months, or with a fever peak above 39.0 ℃ should seek medical advice as soon as possible or receive annual influenza vaccination to reduce the incidence of influenza-associated serious outcomes.

Objective:To understand the reinfection rate of 2019-nCoV in the previously infected population in Suzhou and compare the illness severity and prognosis of the reinfection cases with the first-time infection cases.Methods:A questionnaire survey was conducted in the persons with previous 2019-nCoV infection reported in Suzhou from January 22, 2020 to November 8, 2022 to collect the information about the incidence of reinfection of 2019-nCoV in this population from December 8, 2022 to January 18, 2023. The persons who were infected with 2019-nCoV for the first time were selected by marching the residence, age and gender at ratio of 1∶2 from 2019-nCoV infection community follow-up cohort of Suzhou. By χ2 test, the clinical symptoms and prognosis of the reinfection case and the first-time infection cases were compared. Results:The reinfection rate of 2019-nCoV was 13.01% (147/1 130) in Suzhou. No reinfection was found within 1-6 months after the first-time infection, the rate of reinfection was 10.59% (95/897) in those with interval of 7-12 months between the reinfection and the first-time infection and 45.61% (52/114) in those with the interval ≥24 months. The lowest reinfection rate was 9.09% (1/11) in those who had completed 4 doses of 2019-nCoV vaccination. The main symptoms of the reinfection cases were similar to those of the first-time infection cases. Except for dry cough, nausea/poor appetite and other symptoms, there were significant differences in other clinical symptoms between the two groups ( P<0.05). In the reinfection cases, fever had shorter duration with lower body temperature. The hospital visit rate in the reinfection cases was 4.08% (6/147), lower than that in the cases with the first-time infection (11.56%, 34/294). The time for negative nucleic acid (antigen) test result and recovery from illness after the reinfection were shorter than those after the first-time infection. Conclusions:Reinfection occurred in some people who had been infected with 2019-nCoV. The interval between the reinfection and the first-time infection and the completion of the 4 doses of booster vaccination were the factors influencing the reinfection rate. The hospital visit rate in the reinfection cases was lower than that in the cases with the first-time infection. The reinfection had similar symptoms and shorter illness duration compared with the first-time infection.

We analyzed the influenza surveillance data of Children′s Hospital of Suzhou University from 2016 to 2018 and estimated the hospitalization burden of children under 5 years old due to influenza infection in Suzhou. The results showed that the influenza virus positive rate of 1 451 severe acute respiratory infection (SARI) cases in Children′s Hospital of Suzhou University was 13.6% (95%CI: 11.8%-15.3%; 197 cases), among which the influenza pandemic intensity in 2017-2018 was relatively high, and A/H1N1 was the main pandemic virus. It was estimated that the hospitalization rate of influenza-related SARI in children under 5 years old in Suzhou was 6.9‰ (95%CI: 6.6‰-7.2‰), among which the hospitalization rate of children aged<6 months was higher, up to 11.4‰ (95%CI: 9.9‰-12.8‰).