Privacy-protecting pandemic-bio-surveillance multi pathogen systems

A tangible, non-transitory, machine-readable medium storing instructions that, when executed by one or more processors, effectuate operations comprising:

• obtaining, with a computer system, movement transactions of a population of users, wherein:
• the movement transactions each include a respective starting geographic position, a respective ending geographic position, and a respective datestamp, and
• the movement transactions are obtained without having server-side access to information by which members of the population undergoing changes in geolocation indicated by the movement transactions can be identified, either personally or pseudonymously;
• obtaining, with the computer system, for movement transactions corresponding to a designated window of time, geographic-pathogen-risk scores of starting geolocations that include the starting geographic positions;
• updating, with the computer system, for the movement transactions corresponding to the designated window of time, geographic-pathogen-risk scores of the ending geolocations based on both geographic-pathogen-risk scores of the starting geolocations involved in movement transactions ending at the ending geolocations and rates of traffic at the ending geolocations indicated by movement transactions ending or starting at the ending geolocations;
• and
• storing, with the computer system, the updated geographic-pathogen-risk scores of the ending geolocations in memory.