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Yosuke Suzuki, MD; Reiko Inagi, PhD; Toshiya Aono, MSc; Koichi Yamanishi, MD; Tetsuo Shiohara, MD

Arch Dermatol. 1998;134:1108-1112.

Background  Drug-induced hypersensitivity syndrome is characterized by a severe, potentially fatal, multiorgan hypersensitivity reaction that usually appears after prolonged exposure to certain drugs. Its delayed onset and clinical resemblance to infectious mononucleosis suggest that underlying viral infections may trigger and activate the disease in susceptible individuals receiving these drugs.

Observations  A 60-year-old woman developed an itchy, generalized, erythematous, confluent rash on the 39th day of receiving allopurinol therapy. Even after she discontinued treatment with allopurinol, her skin lesions progressed to a severe blistering skin eruption. After the patient started oral prednisone therapy, her skin lesions resolved with desquamation. After complete resolution, rechallenge with allopurinol led to the development of an erythematous eruption. Titers of human herpesvirus 6 IgG antibodies dramatically increased with the development of the eruption. The results of a polymerase chain reaction and in situ hybridization indicated the presence of human herpesvirus 6 in the skin lesions, although human herpesvirus 7 DNA was detected only by in situ hybridization.

Conclusion  Reactivation of human herpesvirus 6, possibly in concert with human herpesvirus 7, can contribute to the development of a severe drug-induced hypersensitivity syndrome.

From the Department of Dermatology, Kyorin University School of Medicine, Tokyo (Drs Suzuki and Shiohara), and the Department of Microbiology, Osaka University Medical School, Osaka (Drs Inagi and Yamanishi and Mr Aono), Japan.

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