title: [Helicobacter pylori: focus on CagA and VacA major virulence factors].
abstract: After colonizing the human gastric mucosa, Helicobacter pylori can remain within the host for years and even decades, and is associated with several, highly significant gastric pathologies. In Mexico, the seroprevalence at 1 year of age is 20% and the estimated increment in seropositivity per year is 5% for children aged 1-10 years. More than 80% of adults are infected by the time they are 18-20 years old. Bacterial virulence factors have been proposed for H. pylori, such as urease, flagella, heat-shock protein, lipopolysaccharide, adhesions, vacuolating cytotoxin, cag pathogenicity island and the cytotoxin-associated protein, the latter being the most studied mechanism to date.
authors.affiliation: Programa de Inmunología Molecular Microbiana, Facultad de Medicina, Universidad Nacional Autónoma de México, México, DF, México.
authors.forename: Gonzalo
authors.initials: G
authors.lastname: Castillo-Rojas
authors.forename: Marisa
authors.initials: M
authors.lastname: Mazarí-Hiriart
authors.forename: Yolanda
authors.initials: Y
authors.lastname: López-Vidal
mesh_terms: D000942:Antigens, Bacterial / Q000032:analysis* / Q000276:immunology / Q000378:metabolism; D001426:Bacterial Proteins / Q000032:analysis* / Q000276:immunology / Q000378:metabolism; D016481:Helicobacter Infections / Q000150:complications / Q000276:immunology* / Q000382:microbiology; D016480:Helicobacter pylori / Q000276:immunology / Q000378:metabolism / Q000472:pathogenicity*; D006801:Humans; D010437:Peptic Ulcer / Q000276:immunology* / Q000382:microbiology; D016036:Seroepidemiologic Studies; D037521:Virulence Factors / Q000032:analysis*
chemical_list: D000942:Antigens, Bacterial; D001426:Bacterial Proteins; C074689:VacA protein, Helicobacter pylori; D037521:Virulence Factors; C080866:cagA protein, Helicobacter pylori