Virulence Factor, cagA
Virulence Factor, cagA – GI-MAP Test by Diagnostic Solutions
What is cagA?
cagA (cytotoxin-associated gene A) is a virulence factor produced by certain strains of Helicobacter pylori (H. pylori), a bacterium that can colonize the human stomach lining. Not all H. pylori strains carry this gene. When present, cagA significantly increases the bacterium's ability to cause inflammation and damage to the stomach lining.
Why is cagA important?
The presence of cagA-positive H. pylori strains is associated with a higher risk of gastrointestinal diseases, including:
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Peptic ulcers
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Gastritis
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Atrophic gastritis
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Gastric cancer (especially adenocarcinoma)
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MALT lymphoma (mucosa-associated lymphoid tissue)
CagA strains inject the CagA protein into gastric cells, disrupting normal cellular functions and promoting chronic inflammation. This makes them more pathogenic than cagA-negative strains.
What does it mean if your Virulence Factor, cagA result is too high?
What does a positive cagA result mean on the GI-MAP test?
If cagA is detected on your GI-MAP test, it means that a virulent strain of H. pylori is present in your gut. This finding:
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Suggests greater potential for gastric inflammation or damage.
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May help explain symptoms like bloating, acid reflux, nausea, abdominal pain, or even iron or B12 deficiency.
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Can guide your healthcare provider in tailoring a more aggressive or specific treatment plan to eradicate H. pylori and reduce the risk of complications.
Next steps:
If your GI-MAP test shows a positive cagA result:
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Your provider may recommend a confirmatory test, such as a urea breath test, stool antigen test, or endoscopy with biopsy.
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Treatment often includes a triple or quadruple antibiotic therapy with acid suppression, especially if symptoms are present or if there's a personal/family history of gastric disease.
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Nutritional support and gut healing strategies may be added to reduce inflammation and restore a healthy microbiome balance.
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