Bao-An Yang

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Publications (2)2.55 Total impact

  • Source
    Article: Human neutralizing Fab molecules against severe acute respiratory syndrome coronavirus generated by phage display.
    Xiaoping Kang, Bao-An Yang, Yuyang Hu, Hui Zhao, Wei Xiong, Yinhui Yang, Bingyin Si, Qingyu Zhu
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    ABSTRACT: Human recombinant Fab fragments specific for the spike protein of severe acute respiratory syndrome coronavirus (SARS-CoV) were screened from a human Fab library, which was generated from RNAs from peripheral lymphocytes of convalescent SARS patients. Among 50 randomly picked clones, 12 Fabs specially reacted with S protein by an enzyme-linked immunosorbent assay. The microneutralizing test showed that one clone, designated M1A, had neutralizing activity on Vero E6 cells against SARS-CoV. DNA sequence analysis indicated that the light- and heavy-chain genes of M1A Fab belong to the kappa2a and 4f families, respectively. A neutralizing test on purified M1A demonstrated that 0.5 mg/ml of M1A completely inhibited SARS-CoV activity, with an absence of cytopathic effect for 7 days. Real-time fluorescence reverse transcription-PCR also proved the neutralizing capacity of M1A. These data showed that the number of virus copies was significantly reduced in the M1A-treated group, suggesting an important role for M1A in passive immunoprophylaxis against the SARS virus.
    Clinical and Vaccine Immunology 09/2006; 13(8):953-7. · 2.55 Impact Factor
  • Article: [The application of indirect immuno-fluorescence assay in the diagnosis of severe acute respiratory syndrome].
    Li-qun Fang, Pan-he Zhang, Bao-an Yang, Xiao-ming Wu, Qiu-min Zhao, Wei Liu, Hong Liu, Yong-qiang Deng, Lin Zhan, Wei-guo Han, Fu-shuang Lu, Jin-song Wu, Hong Yang, Qing-yu Zhu, Wu-chun Cao
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    ABSTRACT: To explore the temporal profile of serum antibody against coronavirus in patients with severe acute respiratory syndrome (SARS), and to evaluate the reliability of indirect immuno-fluorescence assay (IFA) in the diagnosis of SARS. Clinically confirmed SARS patients, suspected SARS patients, and controls were included in the study. IFA was used to detect the serum antibody against SARS coronavirus. General information about the subjects was collected using a standard questionnaire. The positive rates of specific IgG and IgM against SARS virus within 10 days after onset of the disease were 55.1% and 16.3% respectively and then increased up to 89.8% for IgG and 65.3% for IgM. After 25 days of the onset of the disease, 90.9% patients became positive for both IgG and IgM. Results from chi-square for trend test revealed that the positive rates of both IgG and IgM increased with time (chi(2) for trend = 16.376, P = 0.00005 for IgG; chi(2) for trend = 28.736, P = 0.00000 for IgM). Sensitivity, specificity and agreement value of IFA regarding the diagnosis of SARS were all higher than 90%. IFA can be used to assist diagnosis of SARS after 10 days of the onset of disease.
    Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi 07/2003; 24(6):484-6.
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