A Legionella outbreak has affected 237 people in Manzanares (Ciudad Real, Spain), during the weeks before Christmas holidays, with 4 dead. Initial hypothesis is that the source is likely to be related to a cooling tower. Cooling towers are devices which reject waste heat to the atmosphere and, maybe, aerosols (probably contaminated by Legionella, a microorganism that causes pneumonia when breathing contaminated air). Between Desember 12 and 14th some water samples were taken from water circuits (like fountains, cooling towers, etc.) around the affected area. A cooling tower from the bus station in Manzanares is the main suspect to be the source of contamination.