After a median follow-up of 32 weeks, the tritherapy with the three nucleosides ZDV/ 3TC/ ABC was shown to be virologically inferior to the two other arms regardless of baseline viral load (< or > 100 000 copies/ml) with 26% of subjects on the ZDV/3TC/ABC arm, 16% on the ZDV/3TC/EFV arm and 13% on the 4 drug arm categorised as having virological failure (HIV RNA > 200 copies/ml).