title: [An immunoenzymatic test for IgG antibody levels against 10 serotypes of Streptococcus pneumoniae].
abstract: BACKGROUND
  Streptococcus pneumoniae is a major cause of morbi-mortality in early childhood and elderly. However, a test to measure the antibody responses after specific vaccination is not available in Colombia.
  
  
  OBJECTIVE
  An immunoenzymatic test was standardized for the measurement of serum IgG levels against 10 serotypes of S. pneumoniae in response to the specific vaccination.
  
  
  METHODS
  Capsular polysaccharides 1, 3, 4, 5, 6B, 9V, 14, 18, 19F, 23F of S. pneumoniae were used as antigens in a solid-phase ELISA. These responses were characterized in a randomized selected healthy individuals from a Colombian population.
  
  
  RESULTS
  The reference and control sera showed great reactivity against all the polysaccharides evaluated, especially against polysaccharide 14 and 19F. The lowest reactivity in these two sera was observed against polysaccharide 3 and 4. Among the children evaluated, polysaccharide 5/19F showed the highes pre-vaccination reactivity, and polysaccharide 14/19F showed the highest post-vaccination reactivity. Among the adults, polysaccharides 14 and 19F showed the greatest reactivity pre- and post-vaccination. For all the polysaccharides (excepting polysaccharide 5), an inverse association among high polysaccharide-specific pre-vaccination- and the increase of post-vaccination-IgG levels was observed.
  
  
  CONCLUSIONS
  This ELISA test reliably quantifies the serum levels of specific IgG against 10 serotypes of S. pneumoniae. According to the responses by healthy individuals, the current study validates parameters used internationally as an adequate the response to the 23-valent pneumococcal vaccine.
authors.affiliation: Grupo de Inmunodeficiencias Primarias, Universidad de Antioquia, Medellín, Colombia. cesteban01@hotmail.com
authors.forename: Lucía Carolina
authors.initials: LC
authors.lastname: Leal-Esteban
authors.forename: Jessica Lineth
authors.initials: JL
authors.lastname: Rojas
authors.forename: Andrea Lizeth
authors.initials: AL
authors.lastname: Jaimes
authors.forename: Juan David
authors.initials: JD
authors.lastname: Montoya
authors.forename: Nilton Edu
authors.initials: NE
authors.lastname: Montoya
authors.forename: Lily
authors.initials: L
authors.lastname: Leiva
authors.forename: Claudia Milena
authors.initials: CM
authors.lastname: Trujillo-Vargas
mesh_terms: D000328:Adult; D000907:Antibodies, Bacterial / Q000096:biosynthesis / Q000097:blood* / Q000276:immunology; D000942:Antigens, Bacterial / Q000276:immunology*; D016667:Bacterial Capsules / Q000276:immunology*; D002648:Child; D002675:Child, Preschool; D004797:Enzyme-Linked Immunosorbent Assay / Q000592:standards*; D005260:Female; D006801:Humans; D007074:Immunoglobulin G / Q000096:biosynthesis / Q000097:blood* / Q000276:immunology; D008297:Male; D008875:Middle Aged; D022242:Pneumococcal Vaccines / Q000276:immunology; D011135:Polysaccharides, Bacterial / Q000276:immunology*; D012015:Reference Standards; D015203:Reproducibility of Results; D012703:Serotyping; D013296:Streptococcus pneumoniae / Q000145:classification / Q000276:immunology*; D055815:Young Adult
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D007074:Immunoglobulin G; D022242:Pneumococcal Vaccines; D011135:Polysaccharides, Bacterial