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  • Title: Comparison of topically applied 5-ethyl-2'-deoxyuridine and acyclovir in the treatment of cutaneous herpes simplex virus infection in guinea pigs.
    Author: Spruance SL, Freeman DJ, Sheth NV.
    Journal: Antimicrob Agents Chemother; 1985 Jul; 28(1):103-6. PubMed ID: 4037770.
    Abstract:
    Three percent 5-ethyl-2'-deoxyuridine (EdU) in an aqueous cream base was compared with 5% acyclovir (ACV) in polyethylene glycol ointment and 3% EdU in 95% dimethyl sulfoxide (DMSO) for efficacy in the topical treatment of an experimental dorsal cutaneous herpes simplex virus type 1 infection in guinea pigs. Topical ACV treatment reduced the mean lesion number by 15%, the lesion area by 32%, and the lesion virus titer by 60% when compared with measurements at contralateral sites treated with the vehicle alone. Application of 3% EdU cream was more beneficial, effecting reductions of 29, 44, and 68% in the same measurements. EdU in DMSO was even more effective, reducing the lesion measurements by 39, 60, and 90%, respectively. The penetration of EdU and ACV through guinea pig skin was compared in single-chamber diffusion cells. In the aqueous cream, EdU readily penetrated excised skin and exhibited rates of flux 10-fold greater than those shown by ACV in ointment formulation (0.56 versus 0.05 microgram/cm2 per h; P = 0.05). The flux of EdU in DMSO was 3.39 micrograms/cm2 per h, six times higher than the flux in the cream vehicle. EdU was more effective than ACV in this experimental animal model, most likely due to better percutaneous drug delivery of EdU from the cream and DMSO vehicles.
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