title: Human herpesvirus-6 encephalitis after unrelated umbilical cord blood transplant in children.
abstract: Three children developed human herpesvirus-6 (HHV-6), variant B encephalitis after unrelated umbilical cord blood transplant, in a single center. They developed clinical manifestations of encephalitis around day 17 post transplant. Impairment of consciousness, incoherent speech, episodic focal pruritus, motor weakness, convulsions and severe hyponatremia were features at presentation. Radiological investigation of brain ranged from unremarkable to extensive white matter and meningeal lesions. Diagnosis was established by the presence of HHV-6 DNA in cerebrospinal fluid (CSF). Retrospective analyses of plasma revealed the presence of viral DNAemia prior to the onset of disease in two subjects. Treatment with ganciclovir or foscarnet was given. Two subjects did not achieve engraftment and died of other transplant-related complications on day 38 and 56 post-transplant, respectively. One subject achieved disease-free survival for more than 1 year with a satisfactory neurological outcome. In conclusion, HHV-6 encephalitis is not uncommon among patients undergoing umbilical cord blood transplantation. It is worth conducting further studies on early diagnosis and optimal management of this potentially fatal disease.
authors.affiliation: Department of Paediatrics, Prince of Wales Hospital, The Chinese University of Hong Kong, People's Republic of China.
authors.forename: K W
authors.initials: KW
authors.lastname: Chik
authors.forename: P K S
authors.initials: PK
authors.lastname: Chan
authors.forename: C K
authors.initials: CK
authors.lastname: Li
authors.forename: M M K
authors.initials: MM
authors.lastname: Shing
authors.forename: V
authors.initials: V
authors.lastname: Lee
authors.forename: A F
authors.initials: AF
authors.lastname: Cheng
authors.forename: P M P
authors.initials: PM
authors.lastname: Yuen
mesh_terms: D000998:Antiviral Agents / Q000008:administration & dosage; D002648:Child; D036101:Cord Blood Stem Cell Transplantation / Q000009:adverse effects*; D004279:DNA, Viral / Q000097:blood; D018792:Encephalitis, Viral / Q000175:diagnosis / Q000188:drug therapy / Q000209:etiology*; D005260:Female; D015654:Herpesvirus 6, Human; D006801:Humans; D007938:Leukemia / Q000150:complications / Q000628:therapy; D008297:Male; D012189:Retrospective Studies; D019349:Roseolovirus Infections / Q000175:diagnosis / Q000188:drug therapy / Q000209:etiology*; D014184:Transplantation, Homologous / Q000009:adverse effects; D016896:Treatment Outcome
chemical_list: D000998:Antiviral Agents; D004279:DNA, Viral