title: Genotyping of different varicella vaccine strains.
abstract: BACKGROUND
  Little is known about single nucleotide polymorphism (SNP) in different lots of varicella vaccines distributed by the manufacturers. Recently, the genetic analysis of several genomic regions revealed a polymorphism in different vaccine lots of Varilrix manufactured by GlaxoSmithKline. These findings need attention since mutations in the vaccine strain could result in changes of virulence and efficacy of the vaccine.
  
  
  OBJECTIVE
  To identify SNPs in three varicella vaccine lots of Varilrix and to compare the results with that of Varivax as well as the published sequences of the Oka vaccine strain (V-Oka) and its parental virus (P-Oka).
  
  
  METHODS
  The open reading frames (ORF) 1, 6, 10, 21, 50, 54, and 62 were analyzed by sequencing of amplified DNA fragments.
  
  
  RESULTS
  Wild-type nucleotides identical to that of P-Oka and/or the European wild-type reference strain Dumas and in contrast to V-Oka could be identified in ORF 1 of a Varilrix vaccine lot distributed in 1991. In the ORF 62 probably responsible for attenuation of V-Oka, this vaccine strain contained 16 SNPs which were nearly all wild-type-like. By contrast, different lots of the Varivax vaccine revealed uniform sequencing results. The vaccine Varilrix 1999 showed a high similarity to the Varivax vaccine currently available.
  
  
  CONCLUSIONS
  The obvious genetic diversity of different lots of the varicella vaccine Varilrix cannot be explained with the coexistence of several strain variants in the vaccine, but most likely with different seed lot preparations used for vaccine production.
authors.affiliation: Institute of Virology and Antiviral Therapy, Friedrich-Schiller University of Jena, Hans-Knoell-Strasse 2, D-07745 Jena, Germany. Andreas.Sauerbrei@med.uni-jena.de
authors.forename: A
authors.initials: A
authors.lastname: Sauerbrei
authors.forename: R
authors.initials: R
authors.lastname: Zell
authors.forename: M
authors.initials: M
authors.lastname: Harder
authors.forename: P
authors.initials: P
authors.lastname: Wutzler
mesh_terms: D019943:Amino Acid Substitution; D019433:Chickenpox Vaccine; D005838:Genotype; D014645:Herpesvirus 3, Human / Q000145:classification* / Q000235:genetics; D006801:Humans; D016366:Open Reading Frames; D020641:Polymorphism, Single Nucleotide
chemical_list: D019433:Chickenpox Vaccine