title: Human herpesvirus 6 infection after hematopoietic cell transplantation: is routine surveillance necessary?
abstract: Human herpesvirus 6 (HHV6) may be an important pathogen following allogeneic hematopoietic cell transplantation (HCT). We prospectively evaluated weekly HHV6 viremia testing after allogeneic HCT using a quantitative polymerase chain reaction (PCR)-based assay. HHV-6 viremia was detected in 46 of 82 (56%) patients at a median of 23 days post-HCT (range: day +10 to +168). More males (65% vs females 39%, P = .03) and recipients of umbilical cord blood (UCB 69% vs unrelated donor [URD], 46% vs sibling donor [20%] grafts, P = 0.01) reactivated HHV-6. Patients with HHV6 viremia had more cytomegalovirus (CMV) reactivation (26% vs 5.5%, P = .01) and unexplained fever and rash (23.9% vs 2.7%, P = .01) compared with patients without HHV6 viremia. High-level HHV6 (≥ 25,000 copies/mL) versus lower levels were associated with more culture-negative pneumonitis (72.7% vs 22.8%, P = .01). Twenty HHV6-positive patients were treated with foscarnet, ganciclovir, or cidofovir for HHV6 or other coexistent viruses. Within 2 weeks, HHV6 viremia resolved more commonly in treated (65%) than untreated patients (31%), P = .02. Survival at 3 months was similar in treated and untreated patients (90% vs 81%, P = .4). Survival at 3 and 6 months post-HCT were not affected by HHV6 positivity (3 months HHV6+ 85% vs 78%, P = .46; 6 months HHV6+ 70% vs 72%, P = .89) or by HHV6 level (3-month high level 73% vs 89%, P = .23; 6-month high level 64% vs 71%, P = .54). Neither the occurrence of HHV6, degree of viremia, nor use of antiviral drugs influenced short-term survival after HCT.
authors.affiliation: Department of Medicine, University of Minnesota, Minneapolis, Minnesota, USA.
authors.forename: Brian C
authors.initials: BC
authors.lastname: Betts
authors.forename: Jo-Anne H
authors.initials: JA
authors.lastname: Young
authors.forename: Celalettin
authors.initials: C
authors.lastname: Ustun
authors.forename: Qing
authors.initials: Q
authors.lastname: Cao
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Weisdorf
mesh_terms: D000328:Adult; D000368:Aged; D000998:Antiviral Agents / Q000008:administration & dosage; D002648:Child; D002675:Child, Preschool; D003586:Cytomegalovirus Infections / Q000188:drug therapy / Q000209:etiology / Q000401:mortality; D018572:Disease-Free Survival; D005260:Female; D018380:Hematopoietic Stem Cell Transplantation; D015654:Herpesvirus 6, Human; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D019349:Roseolovirus Infections / Q000097:blood / Q000188:drug therapy / Q000209:etiology / Q000401:mortality*; D012737:Sex Factors; D035781:Siblings; D015996:Survival Rate; D014184:Transplantation, Homologous; D061349:Unrelated Donors; D014766:Viremia / Q000188:drug therapy / Q000401:mortality
chemical_list: D000998:Antiviral Agents