Allergic Diseases

Question: Name the two major divisions of the immune system. Which is older?

Answer:

The immune system can be considered to have two major divisions: the innate immune system and the adaptive or cognitive immune system. The innate immune system is phylogenetically older.

Reference: Adkinson NF, Yunginger A, Busse W, et al (eds): Middleton’s Allergy: Principles and Practice, 6th ed. St. Louis, Mosby, 2004.

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