An allergy is an immune system reaction to a normally harmless substance, such as pollen, dust, pet dander, or a food protein. Watch this to get a better understanding of what that reaction entails. And for more, visit:
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An allergy is an immune system reaction to a normally harmless substance, such as pollen, dust, pet dander, or a food protein. Watch this to get a better understanding of what that reaction entails. And for more, visit:
source