These studies include ACTG 240, where 105 paediatric patients ages 3 months to 6 years received Zerit 2 mg/ kg/ day for a median of 6.4 months; a controlled clinical trial where 185 newborns received Zerit 2 mg/ kg/ day either alone or in combination with didanosine from birth through 6 weeks of age; and a clinical trial where 8 newborns received Zerit 2 mg/ kg/ day in combination with didanosine and nelfinavir from birth through 4 weeks of age.