Costa Rica (1) Genes (1) Minors (1) Water (1) Technology (1) Sewage--Purification (1) Sewage (1) Plants (1) Pipe (1) Months (1) Methodology (1) Mechanical movements (1) Mayo dialect (Piman) (1) Limnology (1) Infection (1) Health (1) Fresh water (1) Fermentation (1) Escherichia coli (1) Death--Causes (1) Children (1) Attention (1) Meses (1) Salud (1) Mecanismos (1) Circulación (1) Limnología (1) Estudio (1) Atención (1) Escherichia coli (1)