ALL DEFINITIONSMpoxDefinitionMpox is a rare disease caused by infection with the mpox virus, which is in the same family of viruses as the smallpox virus. Mpox is less contagious than small pox and produces milder symptoms.Related SpecialistsShowing 3 of 8Annette CameronMDLeslie SudeMDMarietta VazquezMDMore Related SpecialistsRelated Fact SheetsMpox (Formerly Monkeypox)Related DepartmentsInfectious DiseasesInternal Medicine