Antigenic shift is a process that can cause a sudden and significant change in the influenza virus, leading to the emergence of a new strain to which the human immune system has not previously been exposed. This mechanism was indeed responsible for the 1918 Spanish flu pandemic, among other influenza pandemics.

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Antigenic Shift

Question 61

Multiple Choice

Antigenic shift

A) causes rapid change in the influenza virus.
B) can result in an influenza strain that the human immune system has not been exposed to.
C) was responsible for the 1918 Spanish flu pandemic.
D) All of the answer choices are correct.

Correct Answer: