title: What to do when zidovudine fails.
authors.forename: M S
authors.initials: MS
authors.lastname: Saag
mesh_terms: D016049:Didanosine / Q000627:therapeutic use; D015658:HIV Infections / Q000188:drug therapy*; D006801:Humans; D016047:Zalcitabine / Q000627:therapeutic use; D015215:Zidovudine / Q000627:therapeutic use*
chemical_list: D015215:Zidovudine; D016047:Zalcitabine; D016049:Didanosine