Here is how we think that Pokemon Go might be utilized to prevent infectious diseases spread: Please bear in mind that it is hypothesis!
“Reducing the connectivity of the Pokémon Go network to limit transmission of infectious diseases. A) In a normal situation, players of Pokémon Go interact in a “small world network”, in which players (blue dots) battle each other at PokéGyms (red dots). Some players become “hubs” in the network by visiting multiple PokéGyms (green dots). B) If an infectious disease breaks out in a specific part of the city (green area), a virtual quarantine could be instituted by strategically modifying which PokéGyms are visible to individual players.”
Curious Brain 