Safe zones and routes planning

A computer program product comprising:

• one or more computer readable storage media, and program instructions collectively stored on the one or more computer readable storage media, the program instructions comprising:
• program instructions to generate a contact graph for a user in a group of users in an area, based on a pre-defined distance measurement between the user and another user in a same timestamp during a pre-defined time period;
• program instructions to build a profile for the user based on the contact graph, the profile including a probability model corresponding to the contact graph to estimate an infection probability for the user;
• program instructions to calculate an initial route for the user from a first location to a second location in the area;
• program instructions to analyze an infection risk for the user based on the profile and other users within a pre-defined distance to the user in the initial route;
• and
• program instructions to update the initial route based on the analysis to minimize the risk to be infected.

A computer system comprising:

• one or more computer processors, one or more computer readable storage media, and program instructions stored on the one or more computer readable storage media for execution by at least one of the one or more computer processors, the program instructions comprising:
• program instructions to generate a contact graph for a user in a group of users in an area, based on a pre-defined distance measurement between the user and another user in a same timestamp during a pre-defined time period;
• program instructions to build a profile for the user based on the contact graph, the profile including a probability model corresponding to the contact graph to estimate an infection probability for the user;
• program instructions to calculate an initial route for the user from a first location to a second location in the area;
• program instructions to analyze an infection risk for the user based on the profile and other users within a pre-defined distance to the user in the initial route;
• and
• program instructions to update the initial route based on the analysis to minimize the risk to be infected.