What are the differences between primary and secondary line of defense? What factors interfere with these mechanisms? How are these levels of immunity affected in a child, an elderly person, or a person with a chronic disease? Include active, passive, innate, and acquired immunity. Please write 200-250 words. please include 2 citations utilizing two different reference books. Thank you ever so much Requirements: 200-250 words with 2 citations with 2 different reference books.
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