title: [Study on a purified and inactivated Japanese encephalitis vaccine prepared on Vero cells using SA14-14-2 attenuated virus strain].
abstract: OBJECTIVE
  To develop a kind of new Japanese Encephalitis (JE) vaccine prepared on Vero cells.
  
  
  METHODS
  A JE attenuated virus strain SA14-14-2 was adapted on Vero cells for preparation of purified inactivated vaccine. Comparison of the growth curves of SA14-14-2 in roller bottle and in spinner flask was made. After the virus inoculation and absorption on Vero cells for 2 hours, cultures were replaced with serum-free MEM, the culture supernatants were harvested on day 2,4,6 after inoculation. The virus fluids were pooled, concentrated by 8% PEG, and purified on 15%-60% sucrose density gradients. The purified virus was inactivated with 0.02% formalin.
  
  
  RESULTS
  It showed that virus titer was higher and maintained longer in roller bottle. Mice vaccinated twicely with 0.5 microgram dose of the purified inactivated vaccine induced neutralizing antibody titers equal to that of the mice vaccinated with primary hamster kidney inactivated vaccine.
  
  
  CONCLUSIONS
  This Vero cell prepared purified and inactivated JE vaccine made by SA14-14-2 strain could be used for human as a kind of new JE vaccine.
authors.affiliation: National Institute for the Control of Pharmaceutical and Biological Products, Beijing 100050.
authors.forename: Z
authors.initials: Z
authors.lastname: Yao
authors.forename: G
authors.initials: G
authors.lastname: Dong
authors.forename: Y
authors.initials: Y
authors.lastname: Yu
mesh_terms: D000818:Animals; D002522:Chlorocebus aethiops; D022321:Japanese Encephalitis Vaccines / Q000276:immunology; D015164:Vaccines, Inactivated / Q000276:immunology; D014709:Vero Cells
chemical_list: D022321:Japanese Encephalitis Vaccines; D015164:Vaccines, Inactivated