2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/168627We prove a global existence result for a model describing the swarming phenomenon of the bacterium Proteus mirabilis. The model consists of an ordinary differential equation coupled with an age-structured equation involving nonlinear degenerate diffusion and an additional drift term.Analysis of PDEs35G25;35M20;35K65;92C17text