Every year it’s the same story. The Ministry of Health releases TV advertisements with advice on how to prevent the proliferation of Aedes aegypti, the mosquito that causes dengue fever and transmits the Zika virus. The pests like clean, standing water, which can easily accumulate in gardens, potted plants, and the like. Yet, every summer inevitably sees a rise in the number of dengue fever cases in the country’s warmest areas, such as Rio de Janeiro and the Northeast. This year, however, things have gotten even worse.