Question

question 4
1 pts
a doctor’s office has some vials from last year’s batch of flu vaccine in a refrigerator. should they be used to avoid waste?
no, because each year the technology to make a good vaccine improves.
yes, because the preservatives and refrigeration ensure that the vaccine is still fresh.
maybe – the vaccine should be mixed in a test tube with the virus to see if it still inactivates it.
no, because each year the vaccine is made against different subtypes of the flu virus.

Explanation:

The flu virus changes (mutates) into different subtypes each year. So the vaccine from last year is designed for last year's flu subtypes, not the current year's. Option A is incorrect as vaccine tech improvement isn't the main reason for not reusing. Option B is wrong because even with preservation, the vaccine targets old subtypes. Option C is not practical (can't test in a test tube this way for clinical use). Option D is correct as each year's vaccine targets new flu subtypes.

Answer:

D. No, because each year the vaccine is made against different subtypes of the flu virus.