Influenza shows cyclic appearance of extremely virulent strains that cause __________ with high mortality, such as that of 1918, which infected 20% of the world's population and killed more people than World War I.

Question

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Influenza shows a cyclic appearance of extremely virulent strains that cause pandemics with high mortality, such as that of 1918, which infected 20% of the world's population and killed more people than World War I. Therefore, the correct choice is (D) pandemic. The other options are not appropriate because mutation refers to a genetic change, arrestation means detention or stopping, epidemic refers to the occurrence of disease cases in a community or region in excess of what is normally expected, and transgenic refers to an organism that has been genetically modified.

Influenza Shows Cyclic Appearance of Extremely Virulent Strains That Cause