Key Points

• A constantly evolving surveillance strategy, based on existing systems or those established in response to this outbreak

• Data from a wide range of complementary sources, updated very frequently (some daily), to track the epidemic across all its spatial and temporal dimensions

• Data made available to everyone, as open data, in real time

• Data that enabled regionalized monitoring as close as possible to the local areas

• Data that enabled the constant updating of control measures and prevention messages, based on the dynamics of the epidemic

• Data that informed modeling efforts, whose conclusions guided government measures and locally adapted management strategies

• Data enabling the assessment of the impact of prevention measures, particularly vaccination strategies