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A National Malaria Eradication Service (SENEPA) takes a sample of water to check for the existence of the Aedes aegypti mosquito, which transmits dengue and chikungunya, as he inspects a house during a house-to-house eradication operation in Ypacarai, Paraguay, on February 2, 2024. Hospitals in Asunción are receiving many patients with symptoms of dengue. The mosquito-borne disease, endemic to tropical areas, causes high fever, headaches, nausea, vomiting, muscle pain and, in the most serious cases, hemorrhages that can lead to death. (Photo by NORBERTO DUARTE / AFP) (KEYSTONE/AFP/NORBERTO DUARTE)