What is seasonal allergy? Give any two examples of seasonal allergies?
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When the allergy occurs at a particular time of the year, it is called seasonal allergy.
For example, regular sneezing and coughing during winter indicates seasonal allergy; and allergy to pollen grains is very common during spring season.
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What is an allergen? Name any two allergens.
What is hay fever?
What is perennial allergy? Give any two examples of perennial allergies.
Explain how an allergic reaction occurs.