Published on 19 de mayo de 2025 | http://doi.org/10.5867/medwave.2025.04.3031

Event-based surveillance in middle- and low-income countries: An evidence map

Back to article Figure 1

Types of surveillance systems and evaluated characteristics.

PPV: positive predictive value.
VBE: event-based surveillance.
Source: Prepared by the authors based on the study results.