Communicable Disease

PAHO highlights surge in yellow fever cases across the Americas in 2025

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In 2025 so far, there has been a more than eightfold increase in cases compared to the same period of 2024. This is due to the periodic reactivation of sylvatic transmission cycles with spillover cases among people. In total, countries have reported 221 confirmed human cases of yellow fever, including 89 deaths. In comparison, in … Read more

PAHO issues alert on rising risk of dengue outbreaks in the Americas

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Dengue, transmitted by the Aedes aegypti mosquito, has four serotypes: DENV-1, DENV-2, DENV-3, and DENV-4. Immunity against one serotype only provides lifelong protection against that specific serotype, meaning that subsequent infections with other serotypes can increase the risk of severe forms of the disease. The appearance or rise of a serotype that was not … Read more