| Antiviral | EC50 ratio | Phenotype | Strain | Source | Marker | Assay | Reference |
|---|---|---|---|---|---|---|---|
| Maribavir | 2.60 | Low level resistance | Laboratory strain | Recombinant | Details | Diverse cytomegalovirus UL27 mutations adapt to loss of viral UL97 kinase activity under maribavir. (Jan 2009) |