2. METHODS - This is a randomized, open-label. The duration of follow up for evaluating CQ efficacy as a schizonticidal drug was 28 days. The duration of complete follow up to detect recurrent P. vivax infections by passive surveillance was six months. All patients in the CQ alone arm received 7 days of PQ (3.5mg/kg total dose) starting on day 28 of the follow-up.