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The molecular basis for cytomegalovirus drug resistance against currently used antivirals comprises two genetic loci. In the case of ganciclovir, mutations in both the UL97 protein kinase and UL64 DNA polymerase can lead to resistance, whereas for cidofovir and foscarnet only mutations in UL54 give rise to resistance. Clinically, resistance strains of cytomegalovirus appear after prolonged periods...
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