CMV mutations emergence and persistence must be followed in transplanted patients.
UL97 L595S mutation is one of the more frequent mutations conferring GCV resistance.
Sanger and next-generation sequencing technologies must be compared for a routine use.
Compared to Sanger, NGS allowed a deeper discrimination of UL97 L595S evolution.
Along with entropy, NGS contributed to gain deeply insight into UL97 variability.