Even in the short term, though, there are quick lessons to learn. Consider one success story in India — the outbreak in the massive Mumbai slum of Dharavi, where “Slumdog Millionaire” was famously set. Early on, it seemed that Dharavi would almost certainly suffer an exponential rise in cases. Instead, an innovative combination of privately staffed fever clinics, repurposed public infrastructure and manpower from non-governmental organizations managed to flatten the curve there.