The term "________" describes the mutation-caused emergence of multiple viral strains that present differing properties of replication, tissue tropism, and drug resistance within a single infected individual.

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The term "quasispecies" specifically refers to mutant swarms of viruses that emerge within a single host due to the high variability of RNA viruses and the error-prone replication process. Quasispecies can present different properties such as replication efficiency, tissue tropism, and drug resistance, making them challenging to control with antiviral therapies.

The Term "________" Describes the Mutation-Caused Emergence of Multiple Viral