title: Characterization and usefulness of stool antigen tests using a monoclonal antibody to Helicobacter pylori catalase.
abstract: OBJECTIVE
  Two types of stool antigen tests have been used in the management of Helicobacter pylori infection. Testmate Pylori Antigen enzyme immunoassay (TPAg EIA) is a direct sandwich enzyme immunoassay (EIA) while Testmate Rapid Pylori Antigen (Rapid TPAg) is performed using immunochromatography. The aim of this study was to study the characterization and usefulness of these tests.
  
  
  METHODS
  Accuracy of both tests was studied using 111 fecal samples obtained from H. pylori-positive or -negative patients. Cross-reactivity was examined with four other Helicobacter spp. and five fecal bacteria in humans. To estimate the sensitivity of both kits, we tested H. pylori clinical strains. We also examined the diagnostic performances of both tests after the storage for 12 months.
  
  
  RESULTS
  The accuracy of both Testmate kits was 100% in fecal samples from 111 patients. No cross-reactivity was observed in both Testmate kits in five fecal bacteria and four other Helicobacter spp. TPAg EIA and Rapid TPAg showed positive results in 1342 of 1344, and 483 of 485 clinical strains, respectively. Diagnostic performances was maintained for 12 months when TPAg EIA was stored at 4°C and Rapid TPAg at 30°C.
  
  
  CONCLUSIONS
  We examined the details of high accuracy of TPAg EIA and Rapid TPAg. The diagnostic performance of both kits was maintained after storage for up to 1 year. The two types of tests would be useful in the management of H. pylori infection.
authors.affiliation: Sagami Research Laboratories, Wakamoto Pharmaceutical Co. Ltd, Kanagawa, Japan.
authors.forename: Masami
authors.initials: M
authors.lastname: Sato
authors.forename: Tadashi
authors.initials: T
authors.lastname: Shimoyama
authors.forename: Ryoki
authors.initials: R
authors.lastname: Takahashi
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Kajiyama
authors.forename: Yukari
authors.initials: Y
authors.lastname: Sano
authors.forename: Naomi
authors.initials: N
authors.lastname: Sakaedani
authors.forename: Azusa
authors.initials: A
authors.lastname: Kato
authors.forename: Haruhisa
authors.initials: H
authors.lastname: Hirata
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Fukuda
mesh_terms: D000911:Antibodies, Monoclonal; D000918:Antibody Specificity; D000942:Antigens, Bacterial / Q000276:immunology*; D016022:Case-Control Studies; D002374:Catalase / Q000276:immunology*; D002846:Chromatography, Affinity; D003429:Cross Reactions; D005243:Feces / Q000382:microbiology; D016481:Helicobacter Infections / Q000175:diagnosis* / Q000382:microbiology; D016480:Helicobacter pylori / Q000201:enzymology / Q000276:immunology*; D006801:Humans; D007124:Immunoenzyme Techniques; D007564:Japan; D011237:Predictive Value of Tests; D055550:Protein Stability; D011933:Reagent Kits, Diagnostic; D012680:Sensitivity and Specificity; D013696:Temperature; D013997:Time Factors
chemical_list: D000911:Antibodies, Monoclonal; D000942:Antigens, Bacterial; D011933:Reagent Kits, Diagnostic; D002374:Catalase