Equis ISSN 2398-2977

Dermatitis: viral papular dermatitis

Synonym(s): Uasin Gishu disease, Molluscum contagiosum

Contributor(s): Rosanna Marsella, Reginald Pascoe, Sue Paterson, Beatrice Funiciello

Introduction

  • Viral papular dermatitis is an infectious skin disease.
  • Molluscum contagiosum is a rare and mildly contagious skin disease, which although it differs slightly clinically from viral papular dermatitis, has identical histopathology and is considered by some to be the same disease (Moens and Kombe, 1988).
  • Cause: an unidentified pox virus.
  • Signs: papular lesions with hair loss primarily over the trunk seen in viral papular dermatitis; papular lesions primarily over hairless areas in molluscum contagiosum   Dermatitis: molluscum contagiosum 01  .
  • Diagnosis: characteristic histopathology and virus isolation.
  • Treatment: no specific treatment is needed.
  • Prognosis: lesions spontaneously resolve after 4-6 weeks (up to 6 years in Molluscum contagiosum; complete resolution not reported).

Pathogenesis

Etiology

  • Unspecified pox virus.
  • Morphologically identical virions have been identified in both diseases.

Timecourse

Viral papular dermatitis

  • 7 day incubation and resolution within 4-6 weeks.

Molluscum contagiosum

  • Remission of most lesions has been reported to take up to 6 years, but no complete resolution has been reported.

Epidemiology

  • Spread is by direct contact or indirectly by vectors, eg flies.
  • In Molluscum contagiosum human-to-horse transmission may be possible.

Diagnosis

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Treatment

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Prevention

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Outcomes

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Sloet van Oldruitenborgh‐Oosterbaan M M & Grinwis G C M (2018) Viral skin diseases in the Netherlands. Equine Vet Educ 30 (10), 558-563 WileyOnline.
  • Fox R, Thiemann A et al (2012) Molluscum contagiosum in two donkeys. Vet Rec 170 (25), 649 PubMed.
  • Fadok V A (1995) Overview of equine papular and nodular dermatoses. Vet Clin North Am Equine Pract 11 (1), 61-74 PubMed.
  • Mathison P T (1995) Eosinophilic nodular dermatoses. Vet Clin North Am Equine Pract 11 (1), 75-89 PubMed.
  • Van Rosenburg J B et al (1991) Molluscum contagiosum in a horse. J South Afr Vet Assoc 62 (2), 72-74 PubMed.
  • Rothwell T L et al (1991) Unilateral papular dermatitis in a horse. Aust Vet J 68 (3), 122-123 PubMed.
  • Moens Y & Kombe A H (1988) Molluscum contagiosum in a horseEquine Vet J 20 (2), 143-145. (A thorough clinical description of a case of Molluscum contagiosum in a horse and a comparison with other pox virus infections) PubMed.
  • Cooley A J et al (1987) Molluscum contagiosum in a horse with granulomatous enteritis. J Comp Pathol 97 (1), 29-34 PubMed.

Other sources of information

  • Scott D W & Miller W H (2011) Viral and Protozoal Skin Diseases. In: Equine Dermatology. 2nd edn. Saunders, USA. pp 251-262.
  • Knottenbelt D C (2009) Viral Diseases. In: Pascoe's Principles and Practice of Equine Dermatology. 2nd edn. Saunders, USA. pp 129-140.


ADDED