Case numbers are on the rise—at a more worrying rate even than the first wave. We ask why, and what is being done to slow the spread. As revenues at wildlife-tourism spots have dried up, so has security—and now poaching is even more rampant than before.

And scientists’ increasingly audacious bids to see around corners. For full access to print, digital and audio editions of The Economist, subscribe here http://www.economist.com/intelligenceoffer