two independent measures of human immunodeficiency virus type 1 ( hiv-1 ) infection , virus isolation , and serum levels of p24 antigen were evaluated in a double-blind randomized clinical trial of the safety and efficacy of a nucleoside analogue , 3'-azido-3'-deoxythymidine ( azt ) versus placebo in a single center .
C1579410
nucleoside analogue
C0043474
azt