- The total duration of treatment was < 6 months. Patients treated > 12 weeks but < 6 months should have received continuous therapy (no more than 14 consecutive days or 21 total days off during the treatment period). For patients treated = or < 12 weeks, continuous treatment means < 7 days off total during the treatment period. For all patients, a washout period of = or > 4 weeks must have elapsed prior to study entry. Treatment did not result in a major adverse reaction attributable to AZT or IFN-A2a such that rechallenge at a randomly assigned dosage level would be precluded.