title: [Standarization of the plaque-reduction neutralization technique in Vero cells for dengue virus testing].
abstract: BACKGROUND
  the standard plaque reduction neutralization technique has been performed in BHK-21 cells for more than 20 years in Cuba to determine the neutralizing antibodies to dengue. At the end of 2007, the WHO implemented a program to harmonize this technique at all the laboratories worldwide.
  
  
  OBJECTIVE
  the present study was aimed at standardizing the plaque-reduction neutralization technique in Vero cells from the Cultural Lab of"Pedro Kouri" Tropical Medicine Institute.
  
  
  METHODS
  viral strains suggested by Who, strains from the Strain Bank of Arbovirus Laboratory, as well as the panel of human sera from dengue-suspected patients after 5 days of the symptoms.
  
  
  RESULTS
  it was proved that suspension- cultured Vero cells allow higher plaque capacity and quality. Similar results were reached using Arbovirus Bank strains and WHO reference strains.
  
  
  CONCLUSIONS
  it was possible to standardize the plaque-reduction neutralization in Vero cells, with results similar to those of BHK-21 but in longer length of time. Standardization of this technique will allow comparing the outcome of neutralization in the epidemiological studies and vaccine research with those of other laboratories worldwide.
authors: Departamento de Virología, Centro Colaborador de la OMS/OPS, Instituto de Medicina Tropical Pedro Kouri, Ciudad de La Habana, Cuba. mayling@ipk.sld.cu
authors: Mayling
authors: M
authors: Alvarez Vera
authors: Annabel
authors: A
authors: González Rodríguez
authors: Danay
authors: D
authors: Díaz Morejón
authors: Luis
authors: L
authors: Morier Díaz
authors: Maria G
authors: MG
authors: Guzmán Tirado
mesh_terms: D000818:Animals; D003716:Dengue Virus; D006801:Humans; D009500:Neutralization Tests; D014709:Vero Cells