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This manuscript proposes a model of $n$ distinct populations interactionstructured SEIR to describe the spread of COVID-19 pandemic diseases. Theproposed model has the flexibility to include geographically separatedcommunities as well as taking into account aging population groups and theirinteractions. We show that distinct assumptions on the dynamics of the proposedmodel lead to a plateau-like curve of the infected population, reflectingcollected data from large countries like Brazil. Such observations aim to thefollowing conjecture: " Covid-19 diseased diffusion from the capitals to theBrazil interior, as reflected by the proposed model, is responsible forplateau-like reported cases in the country". We present numerical simulationsof some scenarios and comparison with reported data from Brazil thatcorroborate with the aforementioned conclusions.

Why can we observe a plateau even in an out of control epidemic  outbreak? A SEIR model with the interaction of $n$ distinct populations for  Covid-19 in Brazil