title: Acute skin eruptions that are positive for herpes simplex virus DNA polymerase in patients with stem cell transplantation: a new manifestation within the erythema multiforme reactive dermatoses.
abstract: BACKGROUND
  Patients with stem cell transplantation (SCT) develop erythematous eruptions (SCTE) that are often misdiagnosed and poorly treated. Latent herpes simplex virus (HSV) is likely to be reactivated by SCT-associated immunosuppression. Therefore, one of the differential diagnostic possibilities for SCTE is HSV-associated erythema multiforme (HAEM) in which HSV genetic fragments localize in stem cells that deliver them to the skin on differentiation.
  
  
  METHODS
  Lesional skin from patients with SCTE, HAEM, HSV, or drug-induced erythema (DIEM) was stained with antibodies to the HSV antigen DNA polymerase (Pol) and the major capsid protein, virion protein 5 (VP5). The HSV DNA polymerase Pol was expressed in 79% of patients with SCTE and 75% of those with HAEM. The protein VP5 was not expressed in these patients, indicative of the absence of virus replication. Findings in patients with DIEM were negative for both antigens, and those with HSV lesions were positive for both antigens.
  
  
  CONCLUSIONS
  There is a growing problem with SCTE, related to the increasing numbers of performed SCT. The greater frequency of SCT-generated circulating stem cells in patients with hematological malignant neoplasms (who have latent HSV infection) may result in a widespread SCTE characterized by skin deposition of HSV DNA fragments, notably those expressing Pol antigen. This HAEM-like presentation should be considered in the differential diagnosis of SCTE. Prolonged high-dosage antiviral chemotherapy during and after hospitalization may be warranted.
authors.affiliation: Department of Dermatology, University of Maryland, 4401 Roland Ave, Baltimore, MD 21210, USA. josephwburnett@gmail.com
authors.forename: Joseph W
authors.initials: JW
authors.lastname: Burnett
authors.forename: Jennifer M
authors.initials: JM
authors.lastname: Laing
authors.forename: Laure
authors.initials: L
authors.lastname: Aurelian
mesh_terms: D000208:Acute Disease; D000328:Adult; D018952:Antigens, CD34 / Q000032:analysis; D004279:DNA, Viral / Q000032:analysis; D004259:DNA-Directed DNA Polymerase / Q000235:genetics; D004892:Erythema Multiforme / Q000209:etiology / Q000473:pathology / Q000821:virology*; D005090:Exodeoxyribonucleases / Q000235:genetics; D006561:Herpes Simplex / Q000150:complications*; D006801:Humans; D018139:Simplexvirus / Q000201:enzymology / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification*; D033581:Stem Cell Transplantation; D014764:Viral Proteins / Q000235:genetics
chemical_list: D018952:Antigens, CD34; D004279:DNA, Viral; D014764:Viral Proteins; D004259:DNA-Directed DNA Polymerase; D005090:Exodeoxyribonucleases; C043417:DNA polymerase, Simplexvirus