Africa News Tonight - Climate change, deforestation, and urbanization are some of the major risk factors behind the increasing number of outbreaks of viruses such as dengue, Zika, and chikungunya around the world, warns a study by the World Health Organization. And, the Intergovernmental Authority on Development (IGAD) region has faced unprecedented challenges due to a persistent and prolonged drought, marked by five consecutive below average rainfall seasons. For this and more, stay tuned to Africa News Tonight!