WENDELL ROELF PARKED on the roadside next to a graveyard in Cape Town's Gugulethu township, a tuberculosis hotspot, a team of health workers set up a makeshift TB screening room next to their van. Gladys Rara, 45, provides a sputum sample and within 90 minutes results are ready. The rapid testing model, launched in South Africa, will see 10 mobile clinics rolled out across southern Africa in poor communities to diagnose TB patients, in a bid to prevent the disruption surrounding COVID-19 causing a surge in deaths from the world's deadliest infectious disease. "It is very important for them to…