What are allergies?
Allergies are an immune system reaction to a substance called an allergen. Your immune system sees the allergen as harmful and attacks it.
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Allergies are an immune system reaction to a substance called an allergen. Your immune system sees the allergen as harmful and attacks it.
ऊँचाई पर होने वाली बीमारी तब होती है जब कोई व्यक्ति जल्दी से उच्च ऊँचाई पर जाता है , विशेष रूप से 8,000 फीट (2,500 ...