21. The Immune System
Antigens
2:12 minutes
Problem 22
Textbook Question
Textbook QuestionMr. James, an 80-year-old man, is grumbling about having to receive a flu shot every year. Flu viruses have a high mutation rate (undergo rapid genetic changes), which results in the appearance of new proteins on the flu virus's 'coat.' How does this help explain the need to get a flu shot each year?
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