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The role of human herpes virus 6 and 7 in the pathogenesis of pityriasis rosea

Pityriasis rosea (PR) is an acute exanthematous inflammatory skin disease in which many epidemiological studies suggest a viral infection in its pathogenesis. Several viruses such as picornaviruses, parvoviruses and herpes viruses were accused as causative agents in PR. Human herpes virus‐6 (HHV‐6) and HHV‐7 are newly discovered members of herpesviridae family. Several diseases including roseola infantum and PR have been linked with HHV‐6 and HHV‐7 in dermatology. We aimed to investigate the role of HHV‐6 and HHV‐7 in the pathogenesis of PR. Blood samples from 35 patients with acute PR and 30 healthy volunteers were examined to obtain titres for HHV‐6 and HHV‐7 antibodies. Anti‐HHV‐6 and ‐HHV‐7 immunoglobulin (Ig) G antibodies were detected by IFA. The high titres of anti‐HHV‐6 IgG were determined in four patients and anti‐HHV‐7 IgG in only two of four patients.