Birds,especially wild waterfowls,are a natural reservoir of influenza virus,though poultry,mammalians and even human beings are also thought to be the potential hosts.Influenza virus can be classified into subtypes according to the characteristics of the nucleocapsid protein and membrane protein,each subtype with its own most adaptable host,so called host range restriction.However,the outbreak and spreading of influenza in different species has aroused increasing attention since its disastrous consequence on the ecological system of the earth.Large-scale epidemic survey,prediction of possible mutation of the virus,development and application of vaccines are key actions to be taken to prevent the pandemic of influenza.This article offers an overview of the ecology of influenza virus,features of recent great outbreaks of avian influenza,and relevant issues of concern.

The pandemic outbreak of influenza has been started from Mexico in 2009 to 70 countries during 2 months. On 11th of June , WHO announced influenza pandemic alert level rose to the highest level 6, which means the first influenza pandemic in 21st century is coming. Till 6th of July, 94 512 confirmed cases from more than 120 countries and areas were reported, including 429 cases were died. The genetic fragment of swine, poultry sources and human influenza viruses are contained in this strain, A/H1N1 influenza virus, of the pandemic. It is of great significance of studying the genetic reassortment, evolution and its biological characteristics of this virus strain to prevent and control the pandemic. At present, the genetic evolution of strain has been identified, and the potential biological characteristics have been analyzed by genetic traits, however, clinical manifestation should be further concerned, and the tendency of influenza pandemic and genetic changes need to be monitored closely. The complexity of influenza virus ecosystems, mutation of genome, and easy to preserve in "Nature Gene Pool" and reassortment, make the influenza pandemic inevitable. We should face the threat of influenza pandemic, enhance the surveillance of influenza virus in ecosystems, strengthen the epidemiological investigation, develop the vaccines and drugs, and establish an effective public health security system, in order to reduce the destruction of the influenza pandemic.

The cytogenotoxic effect of Na_2SeO_3 on lymphocytes in human whole blood culture was studied. This was done by means of analysis of sisterchromatid exchange (SCE) and determination of unscheduled DNA synthesis (UDS) with the use of scintillometric procedure and autoradiographic observation. The experiments showed that Na_2SeO_3induced a significant increase of SCE value and higher levels of UDS. These results indicate that Na_2SeO_3 has DNA-damaging potential and cytogenotocity, its threshold concentration was 6.48?10~(-7)mol/L.

Objective To observe the clinical curative effect of NB -UVB combined with prednisone on neuralgia following herpes zoster .Methods 84 patients with neuralgia following herpes zoster were randomly divided into treatment group and control group , with 42 in each.The treatment group were given NB -UVB 3 times weekly, and oral prednisone tablet 10mg three times daily for 14 days.The control group was treated with prednisone tablet 10mg three times and indomethacin 25 mg two times daily for 14 days.The visual analogue scale (VAS) was used to evaluate the therapeutic effects in the two groups .Results The effective rate of the treatment group was 88.1%, and that of the control group was 69.05%.The therapeutic effect in the treatment group was statistically significant higher than that of the control group (χ2 =5.974, p=0.015).No marked side effects were observed in both groups .Con-clusion NB-UVB combined with prednisone is effect in the treatment of neuralgia following herpes zostert .

Classic problem-based learning ( PBL ) was applied in a medical microbiology course.The results of questionnaire survey showed most of the students were satisfied with the whole learning program.They thought the case was appropriate,and the discussing could increase their understanding of the knowledge.Based on the problems faced during the application and the students' feedback,the duty of the tutors,summary of the learning topic,arrangement of the course,application of different teaching methods,and selection of the tutors were discussed in detail.

Background and Purpose:dPET/CT is very expensive,so although the accuracy of hPET/CT is less than dPET/CT,it is better than CT,and is useful for guiding the tumor staging before operation.This paper is evaluate the role of ~(18)F-fluorodeoxyglucose(FDG) hPET/CT in primary carcinoma of gastric cardia detection.Methods:26 patients with histologically proven primary carcinoma of gastric cardia underwent whole body hPET/CT imaging.Visual and semiquantitative analysis and standardized uptake value(SUV) were used to analyze the images.The results of hPET/CT study were compared with those of CT.Results:1.The sensitivity of hPET/CT in primary carcinoma of gastric cardia detection was 92.3%(24/26);two cases of signet ring cell carcinoma gave false negative results,and the primary lesions were small(

Objective To compare the cost-effectiveness of closed-loop versus open-loop infusion of propofol guided by bispectral index (BIS) in elderly patients undergoing abdominal surgery.Methods Sixty American Society of Anesthesiologists physical status Ⅱ patients of either sex,aged 65-75 yr,with body mass index of 18 25 kg/m2,undergoing elective open gastrointestinal tumor resection with general anesthesia,were allocated into closed-loop target-controlled infusion (TCI) group (group C) and open-loop TCI group (group O) using a random number table.Propofol was given using closed-loop TCI,and the target BIS value was set at 45-55 in group C.In group O,the target plasma concentration (2.0-3.5 μg/ml)of propofol was adjusted to maintain the BIS value at 45-55.Remifentanil was given by TCI with the target plasma concentration of 2-8 ng/ml in both groups.The total consumption of propofol and remifentanil,time rate of maintaining BIS value within the target range,development of intraoperative hypertension and hypotension,emergence time,tracheal extubation time,time for recovery of orientation,first ambulation time,time to first flatus and length of postoperative hospital stay were recorded.The development of nausea and vomiting and delirium within 3 days after operation and intraoperative awareness was recorded.The cost of anesthetics and total cost of anesthesia were calculated.Results Compared with group O,the total consumption of propofol was significantly decreased,the total consumption of remifentanil was increased,the time rate of maintaining BIS value within the target range was increased,the emergence time,tracheal extubation time and time for recovery of orientation were shortened,the cost of propofol and total cost of anesthesia were decreased (P＜0.05),and no significant change was found in the cost of remifentanil,incidence of postoperative delirium and nausea and vomiting,first ambulation time,time to first flatus or length of postoperative hospital stay in group C (P＞0.05).Intraoperative awareness was not found in two groups.Conclusion Compared with open-loop infusion of propofol guided by BIS,closed-loop infusion of propofol guided by BIS is a cost-effective method of anesthesia in elderly patients undergoing abdominal surgery.

APOBEC(apolipoprotein B mRNA-editing enzyme catalytic-polypeptide) family members were reported as innate immune molecules with anti-viral activity for many viruses, such as HIV and HBV.In order to understand the function of APOBEC, the APOBEC-3F and-3G were cloned, expressed, and the sub-cellular localization of them was detected.The genes of APBEC-3F and-3G were cloned from PHA-stimulated PMBC and expressed in the MDCK cell by transfection.The sub-cellular localization of APOBEC-3F and-3G were detected by immunofluorescence.APOBEC-3F and-3G were cloned by RT-PCR and confirmed by DNA sequencing.The immunofluorescence indicated APOBEC-3F and-3G were located in the cytosal.APOBEC-3F and-3G could inhibit HBV replication effectively in HepG2.2.15 cell.APOBEC-3F and-3G could not be trans-located into nuclear by nuclear location signal(NLS) or bi-NLS(B-NLS).These results will help the future research on the function of APOBEC.

Objective: To investigate the innate immune response of influenza virus-infected glial cells,the transcription levels in chemokines in mouse microglia and astrocytes were detected which pre-infected by human H1N1 or avian H5N1 influenza viruses.Methods: The glial cells isolated from neonatal mice cerebral cortex were cultured and further microglia and astrocytes were purified.The primary mouse microglia and astrocytes were infected in vitro by H1N1 or H5N1 influenza viruses in a multiplicity of infection (MOI) 2.Eight hours post infection,the influenza virus nucleoprotein (NP) was detected by immunofluorescence to identify the proportion of infected cells.The cellular RNA were extracted at 6 h and 24 h to detect the transcriptional level of chemokines by semi-quantitative RT-PCR.Results: More than 95% of the microgha and astrocytes which isolated from mice were infected.The transcription levels of CCL-3,CCL-5,CXCL-2,CXCL-9 and CXCL-10 from infected microglia and astrocytes were upregulated.Futhermore,the mRNA level of CXCL-10 increased much more.In addition,avian H5N1 influenza virus could induce more stronger upregulation of those chemokines than human H1N1 did.Conclusion: The mouse microglia and astro cytes which are infected by H1N1 influenza virus or H5N1 influenza virus could induce upregulation of transcription level of chemokines.

Objective:To study the rule of spontaneous behavior and to explore the effect on emotion of mice peripherally infected with influenza A WSN33 virus( H1N1).Methods: Mice were intranasal inoculated with H1N1 WSN33 or saline.Then mice bodyweight change,and total distance movement,average movement speed distance in the central area and feces in the open field test in 5 minutes were recorded in two weeks.Results: Mice following WSN33 infection bodyweight declined sharply until day 7 post-inoculation,and mice bodyweight recovered from influenza infection at day 8 post-inoculation.Total distance movement of mice following H1N1 WSN33 infection decreased in the open field test,and difference of the reduction was significant from day 5 to day 10 post-inocu-lation.The average movement speed had no statistical difference.The range of numbers of fecal grains was large, and they were no significant difference.Conclusion:The total distance movement decreased,but average movement speed did not change following mice infected with H1N1 WSN33.They told us that mice infected with H1N1 WSN33 had anxiety,depressed and nervous emotion which is more evident in acute stage and early recovery stage,whereas the change of the nervous emotion was small and not obvious.