We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleCountering the posteradication threat of smallpox and polio.AuthorsHenderson DAPublicationClinical infectious diseases : an official publication of the Infectious Diseases Society of America, 2002, Vol 34, Issue 1, p79ISSN1537-6591Publication typearticleDOI10.1086/323897