Outpatient Pediatric Pulse Oximeters in Africa

The primary objective of this clinical trial is to evaluate the performance of three pulse oximeters during outpatient care within Cape Town, South Africa. This objective will be achieved through generating evidence on how, why, for whom, to what extent and at what cost can paediatric pulse oximetry devices improve the management of hypoxemic children. This will be done with two inter-linked studies: * Aim 1: Determine the impact of two novel paediatric pulse oximeter devices on the correct management of hypoxaemia. * Aim 2: Describe the burden of hypoxaemia and risks for mortality amongst children presenting with acute respiratory infections in a low-resource setting in Cape Town.