Abstract
As reflected in the preclinical and early clinical data, acyclovir seems destined to have a very useful role in the treatment and/or prophylaxis of herpes virus (HSV) infections in immunosuppressed humans. If the preclinical predictions can be extrapolated to varicella-zoster (V-Z) infections, acyclovir could well also play a meaningful role in therapy of V-Z infections in the immunosuppressed host; however, this conjecture awaits proof by controlled studies in humans. Clearly the usefulness of acyclovir for treatment of V-Z infections should be compared with that of adenine arabinoside (ara-A) to put into proper perspective the relative efficacies of the two drugs for future therapeutic regimens. The need for comparative studies is most important at this early stage of antiviral drug development, to avoid ethical problems that will cloud the knowledge needed to move forward in a positive way. In any event, the development of acyclovir, with its targeted approach, represents a real fundamental advance in antiviral drug development. Together with the development and deployment of ara-A, it should provide the needed impetus for a surge in the creation of new antiviral compounds for tomorrow.
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