A method includes: periodically receiving data via a ubiquitous network from each of a plurality of devices, where each of the devices is associated with one of the plurality of entities and has a unique identifier; determining, as a function of the received data, a plurality of temporal locations for each of the plurality of entities, each of the temporal locations identifying a time and place where an associated entity was located; and, correlating encounters between two or more of the plurality of entities with incidence data associated with an incident, wherein an encounter is registered when a temporal location of a first of the plurality of entities is within a predefined proximity of at least a second of the plurality of entities within a physical zone associated with the incident.