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              Abstract 
             
           
          
            
We present a Boltzmann equation for mixtures of three species of particles reducing
 to the Kermack–McKendrick (SIR) equations for the time evolution of the
 density of infected agents in an isolated population. The kinetic model is
 potentially more detailed and might provide information on space mixing of the
 agents.
 
 
           
        
        
          
            
              Keywords 
              
                Boltzmann equation, SIR model, low-density limit,
                stochastic particle system, forward cluster
              
             
           
        
        
          
            
              Mathematical Subject Classification 
              
                Primary: 00A71
              
             
           
        
        
          
            
              Milestones 
              
                Received: 16 May 2020
              
              
                Accepted: 26 June 2020
              
              
                Published: 2 September 2020
              
                Communicated by Raffaele Esposito