Fig. 1

Location of the main two P. vivax study sites in Palawan (endemic) and Sultan Kudarat (unstable transmission). Rizal in Palawan has been chosen due to ongoing endemic transmission and availability of archival samples. Kalamansig in Sultan Kudarat was selected for the prospective health-facility based surveys due to the recent P. vivax outbreaks described in Table 1. Other study sites (Occidental Mindoro and Bataan) not shown will provide archival samples as negative controls