Helicobacter Test INFAI may be used for in vivo diagnosis of gastroduodenal Helicobacter pylori infection in: adults; adolescents, who are likely to have peptic ulcer disease. Helicobacter Test INFAI for children aged three to 11 years may be used for in vivo diagnosis of gastrduodenal Helicobacter pylori infection: for the evaluation of the success of eradication treatment, or; when invasive tests cannot be performed, or; when there are discordant results arising from invasive tests. This medicinal product is for diagnostic use only.