Influenza(7) hepatitis E virus(7) famciclovir(6) acyclovir(6) valacyclovir.(6) antivirals(6) amenamevir(6) prodrug(6) Chain termination(6) resistance(6) helicase-primase(6) zoonosis.(5) Epidemic season(4) vaccine.(4) COVID-19(4) Genotype(3) metagenomics(3) Varicella-zoster virus.(3) Idiopathic inflammatory demyelinating disorder(3) In vitro latency system(3) Infection(3) cerebrospinal fluid(3) Live attenuated vaccine(3) outbreak(3) multiple sclerosis(3) Next-generation sequencing(3) VZV-specific cellular immunity(3) anti-HEV IgG(3) vaccination.(3) next-generation sequencing.(3)