 This paper is concerned with a family of Reaction-Diffusion systems  introduced in [ 17 ] that aims at unifying, generalizing, and enlarging the fields of application for epidemiologyand collective behavior models .
<meaning-changed>  This paper is concerned with a family of Reaction-Diffusion systems  introduced in [ 17 ] that aims at unifying, generalizing, and enlarging the fields of application for epidemiologyand collective behavior models .
 This paper is concerned with a family of Reaction-Diffusion systems introduced in [ 17 ] , and that generalizes the SIR type models from epidemiology. Such systems are now also used to describe collective behaviors .