A doctor's office has run out of the latest flu vaccine, but many patients are asking for it. One of the nurses finds some vials from last year's batch in a refrigerator. Should they be used?
A. Yes, because the preservatives and refrigeration ensure that the vaccine is still fresh.
B. No, because each year the technology to make a good vaccine improves.
C. Maybe - the vaccine should be mixed in a test tube with the virus to see if it still inactivates it.
D. No, because each year the vaccine is made against different subtypes of the flu virus.
Answer: D
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