"Rising Dengue Cases in South America Prompt Large-Scale Vaccination Effort"

South America is experiencing a surge in dengue cases, prompting Brazil to launch a vaccination campaign and spray insecticide to combat the disease. The increase in dengue cases is attributed to rising temperatures and the El Nino weather pattern, leading to shortages of insect repellent in affected areas. The spread of dengue has been worsened by climate change, with Brazil reporting a 646% increase in cases in January compared to last year.