ArgentinaMortuary PracticeNatural HistoryMermithoideaLeptospira interrogans serovar icterohaemorrhagiaeGastropodaSecondary Care CentersDisease ReservoirsCitiesPopulation DensitySeasonsUrban HealthFresh WaterAedesPrevalenceUrban PopulationPopulation DynamicsHIV InfectionsGenotypeCross-Sectional Studies