Fig. 4

Time to patency in protection studies 1–3. Patency data from all three protection studies is presented in a Kaplan–Meier graph. Parasitaemia was evaluated on days 5, 6, 7, 9 and 14 post-challenge. Thirty fields, representing approximately 30,000 red blood cells (RBC), were examined for each slide. A mouse was considered positive if a single parasitized RBC was observed