The swift development of effective vaccines against COVID-19 was an unprecedented scientific achievement. But production challenges, vaccine nationalism, and omicron and other variants have all presented hurdles.
As part of global efforts to curb the spread of the new coronavirus, health officials have tried a variety of contact-tracing strategies in countries around the world. Some have been success stories; others have been flops, as governments struggled to get buy-in from the public or shore up the resources needed for comprehensive tracing. Here are five countries’ experiences with contact tracing during the COVID-19 pandemic.