Cidofovir in the treatment of poxvirus infections

Antiviral Res. 2002 Jul;55(1):1-13. doi: 10.1016/s0166-3542(02)00008-6.


Cidofovir [(S)-1-(3-hydroxy-2-phosphonylmethoxypropyl)cytosine, HPMPC] has since 1996 been licensed for clinical use in the treatment of cytomegalovirus (CMV) retinitis in AIDS patients. Cidofovir has broad-spectrum activity against virtually all DNA viruses, including herpes-, adeno-, polyoma-, papilloma- and poxviruses. Among the poxviruses, vaccinia, variola (smallpox), cowpox, monkeypox, camelpox, molluscum contagiosum and orf have proven sensitive to the inhibitory effects of cidofovir. In vivo, cidofovir has shown high efficacy, even after administration of a single systemic (intraperitoneal) or intranasal (aerosolized) dose, in protecting mice from a lethal respiratory infection with either vaccinia or cowpox. Cidofovir has also demonstrated high effectiveness in the treatment of vaccinia virus infection in severe combined immune deficiency mice. In humans, cidofovir has been used successfully in the treatment, by both the topical and intravenous route, of recalcitrant molluscum contagiosum and orf in immunocompromised patients. Taken together, these data indicate that cidofovir should be effective in the therapy and short-term prophylaxis of smallpox and related poxvirus infections in humans, as well as the treatment of the complications of vaccinia that may arise in immunocompromised patients inadvertently inoculated with the smallpox vaccine (vaccinia).

Publication types

  • Comparative Study
  • Review

MeSH terms

  • Administration, Intranasal
  • Animals
  • Antiviral Agents / therapeutic use*
  • Cidofovir
  • Cytosine / adverse effects
  • Cytosine / analogs & derivatives*
  • Cytosine / therapeutic use*
  • DNA, Viral / drug effects
  • Disease Models, Animal
  • Humans
  • Immunocompromised Host
  • Injections, Intraperitoneal
  • Injections, Intravenous
  • Organophosphonates*
  • Organophosphorus Compounds / adverse effects
  • Organophosphorus Compounds / therapeutic use*
  • Poxviridae / drug effects
  • Poxviridae Infections / drug therapy*
  • Poxviridae Infections / immunology
  • Poxviridae Infections / pathology


  • Antiviral Agents
  • DNA, Viral
  • Organophosphonates
  • Organophosphorus Compounds
  • Cytosine
  • Cidofovir