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Rhizopus allergy is an immune system reaction to Rhizopus molds, commonly found in soil, decaying organic matter, and indoor environments with moisture. It is caused by exposure to Rhizopus nigricans spores that trigger IgG antibody production and allergic inflammation in sensitive individuals. The Allergen Specific (m11) IgG Rhizopus nigricans test is the most important test for diagnosing this mold allergy.
Rhizopus allergy is caused by exposure to spores from Rhizopus molds, particularly Rhizopus nigricans, which thrive in damp environments, soil, decaying vegetation, and indoor areas with moisture damage. When you inhale these microscopic spores, your immune system mistakenly identifies them as harmful invaders and produces IgG antibodies to fight them off. This immune response triggers the release of inflammatory chemicals like histamine, leading to allergic symptoms. Common sources include moldy bread, compost piles, leaky basements, bathroom walls, air conditioning units, and areas with water damage or poor ventilation.
The Allergen Specific (m11) IgG Rhizopus nigricans test is the most important test for Rhizopus allergy because it specifically measures IgG antibodies your immune system produces in response to Rhizopus nigricans mold exposure. Elevated levels of these antibodies confirm that your body has been sensitized to this particular mold species and is mounting an allergic response. This blood test is more specific than general allergy panels because it pinpoints the exact mold species causing your symptoms, allowing you to identify and avoid the specific environmental triggers. Unlike skin prick tests, blood tests are not affected by antihistamine use and provide quantifiable results that help track your sensitization level over time.
You should get tested if you experience recurring respiratory symptoms like sneezing, congestion, coughing, or wheezing that worsen in damp environments or after exposure to moldy areas. Testing is especially important if you notice symptoms flare up in basements, bathrooms, or during humid weather, or if you work in agriculture, composting, or food storage where Rhizopus molds are common. You should also consider testing if over-the-counter allergy medications provide only temporary relief or if you have persistent skin rashes and itching without a clear cause. Early diagnosis helps you implement effective avoidance strategies and prevents symptoms from worsening into chronic respiratory conditions.
What this means
Your IgG antibody levels to Rhizopus nigricans are elevated, indicating your immune system has developed a delayed response to this common black mold. This suggests repeated or chronic exposure that may be contributing to ongoing symptoms like congestion, coughing, or fatigue.
Recommended actions
Inspect your home for mold growth, especially in damp areas like bathrooms, basements, and kitchens
Use a dehumidifier to keep indoor humidity below 50% and improve ventilation
Consider HEPA air purifiers to reduce airborne mold spores in your living space
Retest in 3-6 months after environmental improvements to track antibody levels
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