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It is important to improve the lab diagnosis level for effective prevention and treatment of viral hepatitis.By the way of optimizing the routine technology of lab diagnosis,we can improve the sensibility and stability to the international level.Some new technologies,such as molecular biology, proteomies,and metabonomics,should be used to explore some new pattern,fast and associated diagnosis technologies.Meanwhile,we should improve the utilization efficiency of clinical data according the principles of evidence-based medicine,so as to gradually improve the lab diagnosis level of viral hepatitis of our country.

Liver failure progresses quickly with high mortality.Li's artificial liver systems (Li-ALS), which including Li's non-bioartificial liver (Li-NBAL), Li's bioartificial liver (Li-BAL) and Li's hybrid artificial liver (Li-HAL), play an important role in treatment of liver failure.Li-NBAL integrates various of purification methods such as plasma exchange, plasma perfusion, blood filtration modules and so on, providing a standardized treatment of liver failure, and the Li-HAL system has been used to treat animals with liver failure and achieved good results.Besides, this paper also reviews the research progress of the stem cell transplantation as a promising alternative in treatment of liver failure.

The origin,diversity,hemagglutinin protein and mutations of avian influenza A (H7N9) virus are widely studied recently.Although this virus is low-pathogenic in domestic poultry,it becomes highly pathogenic in human when gene mutations occur.The available evidence has revealed that the novel avian influenza A (H7N9) virus is a multiple gene reassortment,and virus shedding in quail and chickens is much higher than in other species.When human infected with H7N9 virus,immune responses will be activated,and massive cytokines and chemokine are produced,which may result in secondary hemophagocytic syndrome and multiple organ dysfunction.The prognosis of H7N9 viral infection may be associated with high level of angiotensin Ⅱ in plasma and the genetic trait of individuals (carrying rs12252-C/C genotype IFITM3).This paper reviews the recent progress on H7N9 virus infection,to provide reference for the control of human infection with H7N9 avian influenza virus and the management of severe cases.

Antibiotic resistance is a serious global public health problem, and China is one of the countries with the serious problem of irrational antibiotic use and bacterial drug resistance.The world is headed for a post-antibiotic era.With the rapid development of microecology, microbiota has been linked with antibiotic resistance.From microecological point of view, it is possible for researchers in different fields to innovate new techniques for bacterial drug resistance, and to explore the evolution of pathogenic bacteria as well as the mechanism of their resistance to antibacterial agents.This paper reviews the research progress in bacterial resistance and microecology, and prospects the future research needs that should be prioritized to tackle antibiotic resistance.

Objective To investigate the influence factors of peripheral blood hematopoietic stem cell of healthy donor by granu‐locyte colony‐stimulating‐factors(G‐CSF) mobilization .Methods G‐CSF was subcutaneously injected in 24 cases of healthy donor for mobilizing hematopoietic stem cells .The T lymphocyte subgroup and blood routine data were detected .Results After G‐CSF stimulation ,peripheral blood CD3+ (% ) ,CD3+CD4+ (% ) ,white blood cell (WBC) count and platelet were significantly increased (P<0 .05) .And nucleated cells density of bone ,percentage of CD34+ cells on mobilized 4 ,5 ,6 d had no obvious difference .The correlation analysis showed that gender ,age and weight were negatively correlated with CD 34+cells percentage (P<0 .05) and pos‐itively correlated with WBC count (P<0 .01) .Conclusion Male donor is superior to female donor within a certain range ,the smal‐ler age ,the lighter weight ,the higher WBC count ,the higher the percentage of CD34+ cells in peripheral blood hematopoietic stem cells after G‐CSF mobilization .

Objective To establish a hepatocyte line from human for bioartificial liver support system and hepatocyte transplantation. Methods Hepatocytes isolated from donor liver of a 25 year old brain death male were transfected with pcDNA3.1(-) recombined vector containing the genes encoding Simian Virus 40 large T antigen. Characteristics of the immortalized hepatocyte line were evaluated by morphologic and functional methods. Results One of the hepatocyte clones displayed highly differentiated liver function and immortalized characteristics has been screened after 42 day's selection of 700～300 ?g/ml G418. The immortalized hepatocyte appeared epithelial and displayed morphologic characteristics of liver parenchymal cells. ALB, AST, ALT and LDH secreted from hepatocyte line were detected. Transmission electron microscope examination revealed that immortalized cells contained a round nucleus with nucleoli, moderate numbers of mitochondria, numerous rough endoplasmic reticulums, and some vacuoles. Adjacent cells were joined with junctional complexes. RT PCR and Western blot detection revealed that immortalized hepatocyte could express ALB mRNA and showed immunoreactive of cytochrome P450 2E1. Conclusions The new established hepatocyte line from human retained some specificbiologic functions and morphological cha racteristics of primary cultured hepatocytes.

Since the outbreak of COVID-19 caused by the 2019-nCoV (SARS-CoV-2), with its high pathogenicity and contagiousness, it has posed a serious threat to global public health security. Up to now, the pathogenesis of 2019-nCoV is unclear, and there is no effective treatment. Vaccine as one of the most effective strategies to prevent virus infection has become a hot area. Based on the current understanding of 2019-nCoV, the development of 2019-nCoV vaccines covers all types: inactivated virus vaccine, recombinant protein vaccine, viral vector-based vaccine, mRNA vaccine, and DNA vaccine, etc. In this review, we focus on the candidate targets of the novel coronavirus, and the types, development status and progress of 2019-nCoV vaccines in order to provide information for further research and prevention.

Objective To determine the structures of resistance transposons and muhilocus sequencing typing(MLST)in the vancomycin resistant enterococcus(VRE).Methods Twenty-one VRE strains were isolated from five hospitals in Hangzhou.The resistance to antimicrobial agents was determined by Etest.Polymerase chain reaction(PCR),conjugation,plasmid extract,transposon structures,pulse field gel electrophoresis(PFGE),muhilocus sequencing typing(MLST),and multiple-locus variable-number tandem repeat analysis(MLVA)were carried out.Results All of the 21 VRE strains harbored the vanA gene.These strains were divided into 10 PFGE types,7 sequence types(STs)and 5 MLVA types.All of these VRE strains were susceptible to linezolid and tigecycline.The vanA genes in two VRE strains were located in transposon Tnl546,and those in the other 19 VRE strains were located in transpeson Tnl546- like,with ISl485 inserted in vanXY.Vancomycin resistance of 1 8 VRE isolates was transferred by filter mating. All of these conjugants had a plasmid containing a molecular size of about 54 000 bo.Conclusions These 21 VRE strains were all caused by the vanA gene and divided into 7 MIST types.A novel trasnposon was detected.Most of these VRE isolates belonged to the clonal complex(CC17)by MIST,which was the hospital-adapted and pandemic VRE clonal complex.

ObjectiveTo investigate the changes of hepatitis B sarfaceantigen (HBsAg) titer in hepatitis B e antigen (HBeAg) positive chronic hepatitis B (CHB) patients treated with nucleos(t)ide analogs and pegylated interferon alfa-2a (PEG IFNα-2a) sequential therapy.Methods Among 6 HBeAg positive CHB patients,3 patients were treated with nucleos(t)ide analogs followed by PEG IFNα-2a for 48 weeks,3 patients were treated with nucleos(t)ide analog monotherapy.The serum HBsAg,anti-HBs,HBeAg,anti-HBe andanti-HBcweredetectedusingthetime-resolved immunofluorometric assay and serum hepatitis B virus (HBV) DNA levels were determined by Taqman polymerase chain reaction (PCR) every 12 weeks.Results HBsAg loss were achieved in three patients after 48-week nucleos(t)ide analogs and PEG IFNα-2a sequential therapy.However,the HBsAg titers of another 3 patients varied from 100 IU/mL to 320 IU/mL.ConclusionIn HBeAg positive CHB patients who obtain virologic response accompanied with HBsAg titer decreasing dramatically by nucleos(t) ide analog treatment,PEG IFNα-2a sequential treatment can increase HBsAg clearance rate.