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An allergy is an abnormal reaction by a person's immune system against a normally harmless substance. A person without allergies would have no reaction to this substance, but when a person who is allergic encounters the trigger, the body reacts by releasing chemicals which cause allergy symptoms.
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| Reason | # Patients | Percentage of patients | |
|---|---|---|---|
| 4 | 80% |
|
|
| 3 | 60% |
|
|
| 2 | 40% |
|
|
| 2 | 40% |
|
|
| 2 | 40% |
|
|
| 1 | 20% |
|
|
| 1 | 20% |
|
|
| 1 | 20% |
|
|
| 1 | 20% |
|
Report created on November 23, 2009.