TOPICAL TREATMENT OF CUTANEOUS HERPES-SIMPLEX VIRUS-1 INFECTION IN MICE WITH A SPECIALLY FORMULATED CAFFEINE GEL (CAFON)

Caffeine, although not a nucleoside analog, is known to inhibit the re plication of herpes simplex virus-1 (HSV-1) and has been shown to sign ificantly limit the spread of HSV infection in vitro. The therapeutic efficacy of caffeine was examined in a murine cutaneous infection mode l. The midflanks of 6-week-old BALB/c mice were infected with HSV cuta neously after application of 10% caffeine (Cafon) gel, and was reappli ed to the midflank 5 limes daily thereafter. Treatment with Cafon gel significantly retarded the development of skin lesions. Both midflanks were cutaneously infected, and a placebo and active gel were applied to the right and left midflanks, respectively. Cafon gel significantly retarded the appearance of vesiculation and reduced the number of ves icles compared with the placebo gel. Cafon gel was as effective as 5%, acyclovir ointment, and no significant difference was observed in the development of local lesions between these two topical preparations. The efficacy of Cafon gel also corresponded to that of oral treatment with 5 mg/kg or more of acyclovir in our cutaneous infection system. T hese results suggest that Cafon gel can be useful for the topical trea tment of cutaneous HSV infection.