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Geography and demography of the five cities represented through synthetic populations. (A) Location of the five cities. (B-F) Geographical representation (Map tiles by Stamen Design, under CC BY 3.0. Data by OpenStreetMap, under ODbL) of the district structure at each city (source: Instituto Nacional de Estadistica, INE), with colors representing the population of each district. (G) Local and non-local populations (nursing homes residents and university students). The five cities studied are Barcelona (BCN), Valencia (VLC), Seville (SEV), Zaragoza (ZGZ), and Murcia (MUR).
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The three symptomatic stages can evolve to the recovered state, while the critical state can alternatively lead to the death of the individual (Supplementary Figure S1).