Described is a location interaction tracking system. The system includes a server storing user information including location information and a plurality of user computing devices coupled to the server. The server may be programmed to receive and store location information from a first user computing device of the plurality of user computing devices and aggregate and anonymize the location information as historical paths of travel, wherein the plurality of user computing devices is programmed to send location information at predetermined intervals. A user may use a user computing device to mark himself as a confirmed case for an infectious agent. The system may then label the aggregated, anonymized location information of the user computing device as confirmed and determine what other user computing devices have crossed within a predetermined distance of the confirmed user during a predetermined past time period and notify the users crossing paths with the confirmed user.