Figure I.

The current WHO height pole with a lower height threshold of 94 cm cannot be used for dosing children smaller than the one depicted and a downwardly extended dosing pole was needed for administration of PZQ for infants and preschool-aged children without recourse to weighing scales. (a) Original WHO (left) and extended (right) height pole with new 0.75 (¾) and 0.5 (½) tablet divisions. (b) Theoretical cross-country validation of the extended height pole with 99 cm, 84 cm, and 60 cm thresholds with best targeted dose of 40 mg/kg denoted by a red arrow, with acceptable dosing (30–60 mg/kg) indicated within the grey box.