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TOPSHOT - A health worker fumigates against the Aedes aegypti mosquito, a vector of the dengue, Zika, and Chikungunya viruses in Contagem, metropolitan region of Belo Horizonte, state of Minas Gerais, Brazil, on February 2, 2024, as the country faces a substantial increase in dengue fever cases. Brazil will begin a dengue immunization campaign in February following a surge in cases that has put the government on alert, officials said. (Photo by DOUGLAS MAGNO / AFP) (KEYSTONE/AFP/DOUGLAS MAGNO)