Methods and systems of prioritizing treatments, vaccination, testing and/or activities while protecting the privacy of individuals

A system for selecting subjects for prophylactically vaccinating a population having a plurality of said subjects with a vaccine against an epidemic infectious disease, comprising:

• a. a plurality of smart electronic devices configured to be carried around by said subjects and configured with instructions to:
• i. using an ID for each said smart electronic device for determining a propensity of proximity of each said plurality of subjects;
• said determining a propensity of proximity comprises:
• at a proximity event, when in proximity of another such smart electronic device, transmitting an ID or an indication thereof to said another smart electronic device and receive an ID or indication thereof from said another smart electronic device;
• said proximity event being an event where a particular said subject could, if infected, potentially infect other subjects with said infectious disease;
• generating a score reflecting a propensity for proximity, according to a plurality of such received IDs;
• said propensity of proximity reflecting a chance of infecting other subjects if said particular said subject becomes infected;
• receiving information from a server;
• displaying relevant prophylactically vaccinating instructions to said subjects based on said received information;
• b. at least one server comprising a memory and a plurality of modules;
• said memory comprising instructions for:
• ii. sending to said plurality of smart electronic devices information usable by a circuitry in said plurality of smart electronic devices to display said relevant prophylactically vaccinating instructions.