Which of the following best describes influenza pandemics?

Which of the following best describes influenza pandemics?
A) They occur frequently but the threat to worldwide health is minimal.
B) They have been mostly eliminated due to the development of vaccines such as Tamiflu.
C) They are easily contained to the region of outbreak.
D) They are unpredictable and occur at irregular intervals.
E) None of the above.


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