They had been registered about 770 deaths alone in the year of 1910, and the illness, that already existed before, without representing a threat to the inhabitants, if it became a constant in the life of the population, arriving to vitimar people until in recent years of existence of city. Many mayors complained of the performance of the Light in the place, for this reason, therefore, the situation of the city if became each more precarious time. The city more than saw the half of its inhabitants to be reached for the illness. Many that had survived to the malaria had run away leaving its houses and lands stop backwards. For that they had been had remained the distrust not to survive to a manifestation of the illness and the tragic scenes, as the witnessed one for Luis Ascendino Dantas: ' ' (...) in one of the houses, a woman deceased had in its col a child who still suck, and its feet another one that chorava' ' . (FLAGLIARI; SAINTS, the 2000) epidemic of malaria was to main the responsible one for the considerable reduction of the population of Is Joo Landmarks.
The number of inhabitants that was around 18.000 in 1898 fell for 7.400 in 1922 arriving the 4,600 in the year of its destruction. The population, that if found the grace of the illness, practically was abandoned by the authorities, per almost two decades. For this reason, population sent letters asking for the presence of doctors and people who could help to skirt the calamity situation that they were living. Second, Agrippino Grieco and Luiz de Brief Souza, who had lived in this period, ' ' In the worse period of the epidemic, enormous ditches in the cemetary confided and much still alive people were for cambulhada hollow of with the deceaseds. In the outskirts dogs met devorando corpses and found up to one criancinha morta.' ' ((FLAGLIARI; SAINTS, the 2000) proper annexation of Are Joo Landmarks the River Clearly, made for decree 635, of 14 of December of 1938, have fort linking with performance of the Light in the region, therefore, the justification for the decay of the city and the impossibility of reerguer it, mainly passed for the interdependence between public health and economy.