- However,mostmutationsaredeleterious.Thosemutationshappenallthetime.Themutationsappeartooccursporadicallyandspontaneously.Manymutationsdonotalteranyimportantfeaturesofthevirusortheillnessitcauses.Thenextpandemicwilloccurthroughadaptivemutations[inthev...
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