Phenotypic mixing and hiding may contribute to memory in viral quasispecies.

Abstract excerpt

BACKGROUND: In a number of recent experiments with food-and-mouth disease virus, a deleterious mutant, RED, was found to avoid extinction and remain in the population for long periods of time. Since RED characterizes the past evolutionary history of the population, this observation was called quasispecies memory. While the quasispecies theory predicts the existence of these memory genomes, there is a disagreement...

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