The U.N. health agency says it has tallied a tenfold increase in the global count of reported cases of dengue over the last generation, with climate change and the growing spread of virus-carrying mosquitos in part to blame for transmission that remains mostly prevalent in the Americas. WHO says reported cases soared to a record 5.2 million in 2019, up from 500,000 in 2000, across 129 countries worldwide – and the figures likely understate the actual toll.
