Abstract

Virus diseases of plants and animals have always played an important role in human economy. The earliest triumphs of preventive medicine were achieved in this field before the nature of such diseases was understood. Their extraordinary capacity to flame up into world-wide epidemics makes their study of primary interest during a world war. The dermatologist has an excellent right to a special interest in virus diseases. The first successful attempt to produce artificial immunity was in smallpox. Most of the infectious exanthems are of virus or rickettsial origin. Pioneer work by Guarnieri, Paschen, von Prowazek, Lipschutz and others on the histology of virus diseases was made possible by the easy accessibility of cutaneous lesions. The intensive study of the cytologic changes caused by the viruses of herpes simplex, herpes zoster, molluscum contagiosum, varicella, variola and others by outstanding students of virus diseases testifies to the opportunity offered by diseases of

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