Influenza shows cyclic appearance of extremely virulent strains that may cause widespread infection with high mortality, such as that of 1918, which infected 20% of the world's population and killed more people than World War I. What is this type of infection called?

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The type of infection described is a pandemic, which refers to a global outbreak of a disease affecting a large number of people. It is characterized by the appearance of a new strain of a virus that has not been previously identified and for which there is no immunity in the population. In contrast, an epidemic refers to a sudden increase in the number of cases of a disease above what is normally expected in a specific geographic area or population, while endemic refers to a disease that is consistently present in a certain region or population. Mutagenic and transgenic are not related to the cycle of appearance of strains in influenza.

Influenza Shows Cyclic Appearance of Extremely Virulent Strains That May