Figure 1: Recording booth:

Cough recordings were made in a standard cross-ventilated sputum collection booth situated outside on the premises of a primary health care clinic in a high-density urban neighbourhood of Cape Town, South Africa. The first panel shows the inside of the booth while the second shows a member of the research staff explaining the recording process to a study participant. The recording environment can be considered challenging due to a constant and considerable level of environmental noise. Co-authors Dr. Byron Reeve (left panel) and Dr. Marisa Klopper (right panel) gave their consent to have their visible faces appear in this figure.