tokens: Seventy - five human immunodeficiency virus (HIV)-infected patients with CD4 + cell counts < 500 / mm3 were randomized to receive either ZDV ( 500 mg daily ) alone ( group I , n = 38 ) or in combination with folinic acid ( 15 mg daily ) and intramascular vitamin B12 ( 1000 micrograms monthly )( group II , n = 37 ). Finally , 15 patients were excluded from the study ( noncompliance 14 , death 1 ); thus , 60 patients ( 31 in group I and 29 in group II ) were eligible for analysis .