Human Helicobacter pylori (H. Pylori) IgA ELISA kit

Specifications

Product Data
Description	Human Helicobacter pylori (H. Pylori) IgA ELISA kit
Size	1 x 96 wells
Format	8x12 divisible strips
Assay Type	Solid Phase Sandwich ELISA
Assay Length	3 hours
Signal	Colorimetric
Sample Type	Serum
Sample Volume	10 µl/well
Specificity	This kit is used for quantitative detection human Helicobacter pylori (H. Pylori) IgA
Reactivity	Human
Cross Reactivity	There is no detectable cross-reactivity with other relevant proteins.
Interference	No significant interference observed with available related molecules.
Components	1. Microwell coated with H. pylori antigen: 12x8x1 2. Sample Diluent: 1 bottle (ready to use): 22 ml 3. Calibrator: 1 Vial (ready to use): 1ml 4. Positive Control: 1 vial (ready to use): 1ml 5. Negative Control: 1 vial (ready to use): 1ml 6. Enzyme conjugate: 1 bottle (ready to use): 12ml 7. TMB Substrate: 1 bottle (ready to use): 12ml 8. Stop Solution: 1 bottle (ready to use): 12ml 9. Wash concentrate 20X: 1 bottle: 25ml
Background	H. pylori is detectable in nearly 100% of adult patients with duodenal ulcer and about 80% of patients with gastric ulcer. An association between H. pylori and gastric cancer is confirmed. In developing countries, where most children become infected by the age of 10, gastric cancer rates are very high. In the USA and other developed countries, standards of hygiene and the increasing socioeconomic status of the population have reduced the incidence of infection, and in parallel, the rates of peptic ulcers and gastric cancer have declined. There is excellent correlation between the clinical presentation of gastritis, the presence of H. pylori in the stomach and elevated serum H. pylori IgG and IgA antibodies. ELISA sensitivity and specificity are 90%, and the predictive value of a negative result for is very high. H. pylori IgG and/or IgA antibodies falls significantly after successful antibacterial therapy. Eradication of H. pylori is associated with a significant reduction in duodenal ulcer recurrence. pylori strains are classified into two broad groups - those that express both VacA and CagA (type I) and those that produce neither (type II). Type I strains are predominate in patients with ulcers and cancer. Up to 50% of adults is infected with H. pylori, but most of them are asymptotic and will not develop ulcer. The reason is they are infected with type II. 80-100% of patients with duodenal ulcer disease produce CagA antibodies against a 128 kd antigen compared with 60- 63% of H. pylori-infected persons with gastritis only, indicating that serologic responses to the 128 kd protein are more prevalent among H. pylori-infected persons with duodenal ulcers than infected persons without peptic ulceration. In H. pylori-infected patients who develop gastric cancer, serum IgG against CagA 94% sensitive and 93% specific, indicating that detection of antibodies to CagA is useful marker for diagnosis of duodenal ulcer and gastric cancer.

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