ChickenpoxChickenpox VaccineHospitalizationHerpesvirus 3, HumanHerpes ZosterSkin Diseases, ViralHerpes Zoster VaccinePneumonia, ViralCell DeathVaricellovirusCause of DeathSmallpoxAcyclovirIncidenceFasciitis, NecrotizingInfant, NewbornMass VaccinationRisk FactorsVaccinationDeathInfectious Disease Transmission, Patient-to-ProfessionalLength of StayImmunity, HerdMumpsIsraelAge DistributionRetrospective StudiesDisease OutbreaksTime FactorsAge FactorsAntibodies, ViralSeasonsUnited StatesMedical History TakingWales