Fig. 2From: Differentiated prevention and care to reduce the risk of HIV acquisition and transmission among female sex workers in Zimbabwe: study protocol for the ‘AMETHIST’ cluster randomised trialAlgorithm for the primary outcome: risk of HIV transmission among HIV positives. (a) OR risk of acquisition among HIV negatives (b). Y-chromosome test (Y-Chrom), GC (Neisseria gonorrhoea test), PrEP (pre-exposure prophylaxis), positive (+ve) and negative (−ve). FSW is at risk of transmission (red) or not at risk of transmission (green), yellow means additional tests are needed to classify them as ‘at risk’ or ‘not at risk’ of transmission/acquisition. Several questions were used to ascertain consistent condom (any condomless sex) (see Appendix Table A3). Asterisk indicates the following: in a sensitivity analysis, 350 fmol/DBS punch threshold will be used to classify FSW currently on PrEP as high vs low PrEP adherenceBack to article page