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  • Title: Studies in the prophylaxis of herpes infections in severely immunocompromised patients using acyclovir.
    Author: Prentice HG, Hann IM.
    Journal: Schweiz Med Wochenschr Suppl; 1983; 14():26-9. PubMed ID: 6361988.
    Abstract:
    That acyclovir is effective therapeutically in herpes simplex virus (HSV) and herpes zoster (VZV) infections in immunocompromised patients has been established [13]. This paper reviews our subsequent studies in prophylaxis of herpes group infections in a high risk group of patients suffering from acute leukaemia. In study 1 we randomised HSV seropositive (greater than or equal to 1:8) patients to receive intravenous acyclovir or placebo. In this stratified study bone marrow transplant (BMT) recipients were completely protected from HSV infections by acyclovir compared with a 50% failure rate for those on placebo. There was significant protection also in the non-BMT group [8]. In study 2 oral acyclovir prophylaxis failed to provide complete protection in BMT recipients despite the achievement of apparently adequate blood levels. In study 1 the secretion of EBV in saliva before and during the trial gave inconclusive results. In each of the first two studies one patient on "active" acyclovir developed a cytomegalovirus (CMV) infection. Thus, at the dosage of drug used, prophylaxis of CMV was unsuccessful suggesting that claims of therapeutic efficacy are unlikely to be supported in controlled trials. Study 3 is current and concerns the pharmacokinetics of an acyclovir prodrug (BW 134U) taken by mouth. This drug is near 100% absorbed and achieves approximately twice the level of active acyclovir in vivo, following conversion by adenosine deaminase (ADA), in normal volunteers.
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