RESUMO
BACKGROUND: Herpes simplex virus (HSV) may cause severe disease in the neonate with high mortality and devastating sequellae. This infection presents exceptionally as isolated fulminant hepatitis. CASE REPORT: An 8 day-old baby was admitted because of seizures, fever and vomiting. Initial investigations including CSF analysis were negative and the patient was given ampicillin plus netilmicin. Two skin vesicles were seen 5 days later containing HSV. A second CSF analysis was negative as was the brain scan. At that time, liver involvement was evident: ASAT 3700 IU/l; ALAT 1035 IU/l; prothrombin 37%; fibrinogen 1 g/l. Hemogram showed WBC: 2,500/mm3 and PNN: 702/mm3. The patient was given acyclovir 40 mg/kg/day IV. Blood and CSF culture remained negative; CSF interferon concentration was 4 IU/ml. Serologic investigations in both parents were inconclusive. The disease worsened rapidly with consumption coagulopathy requiring ventilation support. The dose of acyclovir was increased to 60 mg/kg/day, 9 days after admission. Improvement was noted on the 10th day and acyclovir was administered orally on the 21st day. The condition was completely normal 6 months later. CONCLUSION: Early administration of acyclovir may favor complete recovery of neonatal HSV hepatitis.