PROTOCOL OUTLINE:

This is a randomized, double blind, placebo controlled, multicenter study.

All patients undergo a lumbar puncture and then receive acyclovir IV every 8 hours on Days 1-14. On Day 12, patients may undergo a lumbar puncture (at discretion of investigator). Whole blood is obtained for herpes simplex virus PCR analysis. Upon completion of intravenous therapy, patients with a negative CSF PCR are randomized to one of two treatment arms.

Arm I: Patients receive oral acyclovir three times daily for 6 months.

Arm II: Patients receive placebo three times daily for 6 months.

In case of cutaneous recurrence during the first 12 months of the study, patients receive open label oral acyclovir (if CSF PCR is negative) or acyclovir IV (if CSF PCR is positive) for 5 days. Patients may or may not continue on study drug following this treatment.

Patients are followed at 6, 12, 24, 36, 48, and 60 months of age.

PROTOCOL ENTRY CRITERIA:

--Disease Characteristics--

Infants diagnosed with herpes simplex virus infection limited to skin, eyes, and mouth; HSV-1 or HSV-2 isolated from cutaneous lesions, conjunctivae, or oropharynx (presence of skin lesions not required); normal CSF indices: WBC less than 22/mm3 and protein less than 115 mg/dL for term infants OR WBC less than 25/mm3 and protein less than 220 mg/dL for preterm infants; no evidence of CNS involvement by CT with contrast, MRI with gadolinium, or head ultrasound; no visceral dissemination (normal liver function tests, normal chest x-ray, etc.); negative CSF PCR result

Birth weight at least 800 grams

--Prior/Concurrent Therapy--

No concurrent nursing from a mother who is receiving acyclovir, valacyclovir, or famciclovir for longer than 120 hours or 5 days; no prior prophylactic acyclovir for risk of herpes simplex virus infection

--Patient Characteristics--

Renal: Creatinine no greater than 1.5 mg/dL

Cardiovascular: No prior grade 3 or 4 intraventricular hemorrhage

Other: No infants known to be born to HIV-positive women